Omar Khalid
If your dishwasher is turning plastic orange, it's likely due to tomato-based food residue, such as pasta sauce or ketchup, which contains carotenoid pigments. These red pigments dissolve in oil, are absorbed into the plastic, and can cause discolouration. Fatty or oily foods can increase the risk of this type of staining. To prevent this, it's recommended to rinse dishes with tomato-based sauces before putting them in the dishwasher and to avoid washing plastic items with these dishes.
| Characteristics | Values |
|---|---|
| Cause | Carotenoid pigments in tomato-based foods, baked beans, tinned spaghetti, and food colouring used in curries and turmeric |
| How it works | The red pigments dissolve in oil, which is then absorbed by plastic surfaces |
| Prevention | Rinse dishes with residue under hot water before loading into the dishwasher |
| Cleaning | Direct UV sunlight can remove pigmentation; citric acid and specific detergents can help with general staining |
| Not caused by | Rust or iron in water, bleach will not remove the orange tint |
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What You'll Learn
Plastic items may be absorbing carotenoid pigments from food
Plastic items in the dishwasher can turn orange due to the absorption of carotenoid pigments from food. Carotenoids are commonly found in red and orange-coloured foodstuffs such as tomatoes, baked beans, tinned spaghetti, and are also used in food colouring for curries. These pigments are fat-soluble, so they readily dissolve in oils and fats present in food residues. During the wash cycle, the oil-dissolved carotenoids are suspended in the wash water and subsequently absorbed by the plastic surfaces, resulting in the orange discolouration.
This phenomenon is not unique to dishwashers; it can also occur when reheating foods in plastic containers in the microwave. Plastic dishes and tableware, as well as plastic parts inside the dishwasher such as basket wheels and cutlery baskets, are all susceptible to this type of discolouration. It is important to note that the discolouration is not due to a fault with the dishwasher, and a service engineer will not be able to resolve the issue.
To prevent plastic items from turning orange, it is recommended to rinse dishes thoroughly under hot running water before loading them into the dishwasher, especially when dealing with fatty or oily foods that are known to contain carotenoids. While bleach will not remove the absorbed carotenoids, placing the discoloured items in direct UV sunlight may help fade the orange tint over time.
In addition to carotenoid pigments, other factors can contribute to orange stains in dishwashers. For example, hard water can leave orange or reddish stains, and certain dishwasher detergents may also be too harsh, leading to discolouration. Biofilm, a persistent bacteria called Serratia marcescens, can also cause an orange or pink slime coating in the dishwasher, especially when grease and food residues are left behind.
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Fatty residue and grease in the dishwasher can cause bacteria
If you've noticed orange stains on your plastic dishes and dishwasher components, this is likely due to fatty residue and grease in your dishwasher. This residue provides a breeding ground for bacteria, specifically Serratia marcescens, which thrives in colonies and appears as a pink or orange slime. This bacteria is persistent and challenging to eliminate, as it sticks to surfaces and is difficult to remove.
Fatty and greasy substances can build up in your dishwasher over time, particularly if you don't regularly clean it or properly scrape excess food from dishes before loading them. This buildup can then lead to the proliferation of bacteria, resulting in the orange stains you're observing. To prevent this from occurring, it is recommended to clean your dishwasher at least every two months, or more frequently if you use it more than twice a day.
Additionally, the type of detergent you use and the water temperature in your dishwasher can impact the formation of fatty residue and grease buildup. If your detergent is not sufficient for your needs, it may not effectively cut through grease, leading to residue buildup. Similarly, if the water temperature is too low, it may not adequately dissolve grease and fatty substances, contributing to the problem.
To address the issue of fatty residue and grease causing bacterial growth and orange stains, you can try the following:
- Use a higher-quality dishwasher detergent that is designed to cut through grease.
- Increase the water temperature in your dishwasher to ensure it reaches between 120-150 degrees Fahrenheit (49-66 degrees Celsius). This temperature range is optimal for killing bacteria and breaking down grease.
- Clean your dishwasher regularly, including all crevices and rinse out any remaining debris. This helps prevent the buildup of grease and fatty residue.
- Rinse dishes with water and scrape off excess food before loading them into the dishwasher. This will reduce the amount of grease and fatty residue that builds up in the machine.
- Avoid washing fatty or oily dishes together with plastic items, as this can increase the risk of discolouration.
By following these steps, you can help prevent the formation of fatty residue and grease buildup, which will reduce the occurrence of bacterial growth and orange stains in your dishwasher and on your plastic dishes.
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Poor glazing on dishes can make them susceptible to tinting
Additionally, when the glaze shrinks more than the body of the dish, cracks can form, causing crazing. This can be due to temperature and humidity changes, or moisture getting into the glaze and forcing cracks. Crazing can also be caused by the presence of lead or other toxins in the glaze, which can leach into food through the cracks. While contemporary ceramic glazes are usually lead-free, it is important to check to ensure the safety of your dishes.
Poor glazing on dishes can make them more susceptible to tinting from pigmented foods, such as tomato sauce or turmeric. This is because the pigments in these foods, known as carotenoids, dissolve in any oil present and are then absorbed by the plastic surfaces of the dishes. While this discolouration does not indicate any fault with the dishwasher, it can be unsightly and difficult to remove.
To prevent tinting on dishes with poor glazing, it is recommended to rinse dishes with residue under hot running water before loading them into the dishwasher. Using a higher-quality dishwasher detergent may also help to prevent this issue.
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Hard water may cause rust stains
If your dishwasher is turning plastic items orange, it may be due to hard water. Hard water contains minerals, such as iron, that can leave rust stains on dishes and plastic items. These stains can be difficult to remove, even with dishwashing detergent or bleach. While some sources suggest using a water softener or adding citric acid to the detergent cup to prevent and treat rust stains, others recommend trying a different detergent altogether.
It's important to note that not all discolouration is caused by rust. For example, carotenoid pigments found in tomato-based foods, baked beans, tinned spaghetti, and some spices like turmeric can also cause plastic items to turn orange or pink. These pigments dissolve in oils, which are then absorbed by the plastic surfaces during the wash cycle. While bleach will not remove this type of discolouration, placing the items in direct UV sunlight may help fade the orange tint over time.
To prevent rust stains caused by hard water, you could consider attaching a water softener filter at the water source or using specific detergents designed to soften water and remove residue. These detergents often contain sodium-based ingredients like sodium citrate or sodium carbonate, which help to keep your dishwasher clean and free from mineral buildup. Additionally, rinsing dishes thoroughly before loading them into the dishwasher can reduce the amount of residue available to cause discolouration.
It's worth noting that some dishwashers are equipped with a hard water feature that softens water before each cycle. If your dishwasher has this feature, make sure it is activated to help prevent rust stains on your dishes and plastic items. However, if your dishwasher does not have this feature, you may need to rely on additional methods, such as water softeners or specialised detergents, to combat the effects of hard water.
While hard water and food pigments are the most common causes of orange discolouration in dishwashers, it's always a good idea to thoroughly clean your dishwasher and inspect it for any other potential sources of the issue. Regular cleaning can help remove grease and food buildup, creating an environment less conducive to bacteria and rust formation. Additionally, certain dishwasher detergents may contribute to discolouration, so experimenting with different brands or types of detergent may help alleviate the problem.
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Using cheaper dishwasher tablets can cause discolouration
While a dishwasher is an appliance designed to clean things, it can also be the source of discolouration for plastic items. This is due to the presence of carotenoid pigments in tomato-based foods, such as ketchup, baked beans, and tinned spaghetti, which can dissolve in oil and then be absorbed by plastic surfaces during the wash cycle. The use of cheaper dishwasher tablets may contribute to this issue by failing to effectively remove food residue and stains.
Cheaper dishwasher tablets may not contain the same concentration or quality of enzymes, bleach, and other cleaning agents found in more expensive brands. These biological catalysts are essential for breaking down food residue, particularly stubborn stains from tomato sauce and other fatty or oily foods. Without sufficient cleaning power, these food residues can be left behind, providing a breeding ground for bacteria and contributing to discolouration.
Additionally, cheaper dishwasher tablets may be wrapped in plastic, which adds to the environmental concern of disposable plastic waste. Some cheaper tablets may also lack the protective film that prevents water from entering the tablet, impacting their effectiveness. While more expensive tablets may also use plastic packaging, there are eco-friendly alternatives available that are 100% plastic-free and proven to effectively remove stains.
To prevent discolouration, it is recommended to use a higher-quality dishwasher detergent and rinse away any food residue before loading dishes into the dishwasher. While this may not completely eliminate the issue, as some discolouration can occur even without direct contact with coloured food, it can help reduce the severity.
In summary, using cheaper dishwasher tablets may contribute to plastic discolouration in appliances by failing to adequately remove food residue and stains. This can be mitigated by investing in higher-quality detergents, being vigilant about rinsing dishes before washing, and opting for eco-friendly alternatives to reduce plastic waste.
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Frequently asked questions
Plastic items in your dishwasher may turn orange due to carotenoid pigments present in tomato-based foods, such as ketchup, pasta sauces, or curries. These pigments dissolve in oil, which is then absorbed by the plastic surfaces.
Yes, in addition to tomato-based foods, other foodstuffs containing carotenoids can also cause orange discoloration. These include baked beans, tinned spaghetti, and turmeric.
To prevent orange discoloration, it is recommended to rinse dishes thoroughly under hot running water before placing them in the dishwasher to remove any residue of sauces or gravy. You may also want to avoid washing dishes with carotenoid-containing foods together with plastic items.
The orange color cannot be removed with bleach because the plastic has absorbed the discoloration. One possible method to remove the pigmentation is to expose the items to direct UV sunlight, although this may take a significant amount of time, especially in the UK.
No, there are no harmful effects associated with the discolored appearance. However, it is recommended to maintain good hygiene practices by regularly cleaning your dishwasher and rinsing dishes before placing them in the machine.
