
Keeping your car in good condition is an essential part of vehicle ownership. One of the most expensive parts to maintain is the transmission, which is also one of the most sophisticated mechanisms in a car. To keep it running smoothly, it is important to clean the transmission pan regularly. However, there is a lot of debate about the best way to do this without contaminating the pan. Some sources suggest using brake cleaner, but others advise against it due to the risk of residue and contamination. Other options include using a pressure washer, degreaser, diesel, or a combination of these methods.
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What You'll Learn

Using brake cleaner and rags
Before cleaning, it is important to drain the transmission fluid from the pan. This can be done by locating the drain plug and allowing the fluid to drain into a large metal basin. Alternatively, if there is no drain plug, loosen the bolts holding the pan in place and remove the bolts on one side to allow the fluid to flow out.
Once the fluid has been drained, you can begin cleaning with brake cleaner. Spray the inside of the pan generously with the brake cleaner, ensuring that all surfaces are covered. Brake cleaner is effective at cutting through oil and grease and will leave no residue when dry. After spraying, use clean microfiber rags or shop towels to wipe down the pan thoroughly. It is important to ensure that the pan is completely dry before reinstalling it.
Some people also recommend using compressed air after wiping down the pan to ensure that any remaining lint or debris is removed. Additionally, if there is heavy grime or grease buildup, you can use diesel fuel to wash the pan before spraying it with brake cleaner. This will help loosen and remove stubborn deposits.
By following these steps and paying attention to the details, you can effectively clean your transmission pan using brake cleaner and rags, ensuring that your vehicle's transmission remains in good condition.
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Aqueous parts washers
The process of using an aqueous parts washer typically involves placing the transmission parts, such as the pan, into the washer and starting a cleaning cycle. The washer uses high-pressure spray jets to loosen and remove contaminants. The water is heated, which helps to dissolve grease and grime, and the parts dry quickly after removal from the washer due to the heat.
Some popular brands offering aqueous parts washers include StingRay, Jenfab, and PROCECO. These washers are designed for industrial and commercial use, with features such as adjustable nozzles, filtration systems, agitation systems, and automatic detergent dispensers. The washers are built with durable materials like stainless steel and corrosion-resistant finishes.
In addition to aqueous parts washers, other methods for cleaning transmission pans include using brake cleaner, diesel fuel, or engine degreaser. However, these alternatives may require more manual labour and have a higher risk of leaving residue or contaminating the pan.
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Engine degreaser
There are several different types of engine degreasers that can be used, including:
- Gunk engine degreaser: This product is mentioned by several users and is available at auto stores and Walmart. It is meant to be applied and then washed off at a DIY car wash.
- Greased Lighting degreaser: This product is similar to Simple Green but is mentioned to be more effective. It can be purchased at AutoZone and Walmart.
- Fast Orange: This product is mentioned to be effective and safe, and it will not leave an oily residue. However, it will cause the parts to rust, so it is important to assemble the parts quickly after cleaning.
- Castrol Degreaser: This product is mentioned by several users and is available at auto stores. It is known to be strong and effective, but it can irritate the eyes and lungs.
When using engine degreaser to clean a transmission pan, it is important to follow the instructions on the product and take safety precautions, such as wearing protective gear. It is also crucial to ensure that the product is compatible with the transmission pan and will not cause any damage. After applying the engine degreaser, it is typically recommended to rinse or wipe off the product with a rag or towel. Some users also mention using a pressure washer or taking the parts to a car wash to remove the degreaser and any remaining grease or grime.
Overall, engine degreaser is a viable option for cleaning transmission pans and parts. It is important to choose a suitable product, follow safety instructions, and properly rinse or remove the degreaser after application.
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Diesel fuel
While diesel fuel can be used to clean transmission parts, it is not recommended for cleaning the transmission pan. This is because diesel fuel is flammable and can contaminate the pan.
For at-home mechanics, diesel fuel can be used to wash transmission parts to get the heavy grime off. However, it is important to note that diesel fuel should not be the only cleaning agent used. After washing with diesel fuel, it is recommended to use Brakleen or brake cleaner to spray off the remaining diesel and remove any residual dirt or grime. The parts should then be set aside to dry, and the assembly should be done fairly quickly to prevent surface rust from setting in.
In addition to diesel fuel, other cleaning agents such as engine degreaser, Varsol, and mineral spirits can be used for washing transmission parts. However, it is important to exercise caution when using any cleaning agents, as some can be harmful to certain components. For example, water-based solutions should be avoided when cleaning solenoids, friction plates, and bands, as they can damage these parts.
While diesel fuel can be an effective cleaning agent for transmission parts, it is important to weigh the benefits against the potential risks and always follow the manufacturer's recommendations for cleaning and maintenance.
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Dish soap
While some people suggest using water to clean a transmission pan, others warn against it, saying that it can contaminate the pan. If you are set on using water, it is recommended to use hot water and a parts washer. However, these machines are usually only available at car washes or shops, and not accessible for at-home mechanics.
If you are set on cleaning your transmission pan at home, there are several alternatives to water that you can use. One option is to use a brake cleaner, such as Brakleen, and microfiber cleaning rags. It is important to wipe everything dry after using the brake cleaner to avoid leaving any residue. Another option is to use a degreaser, such as Greased Lightning degreaser or Fast Orange, which is known for being effective and safe. Diesel fuel can also be used to wash the transmission pan, but it is important to note that it will leave an oily film.
- Start by raising the front end of your vehicle and scraping off as much of the built-up dirt and grease as possible using a tire brush.
- Fill a bucket with hot water and add a small amount of dish soap.
- Use a wash mitt to scrub the transmission pan with the soapy water, paying extra attention to any particularly greasy areas.
- Rinse the transmission pan with clean water to remove any soap residue.
- If needed, use a pressure washer or steam cleaner to remove any stubborn grease or dirt.
- If there is still grease or dirt remaining, you can use a degreaser or brake cleaner, following the instructions on the product label.
- Finally, dry the transmission pan thoroughly with a clean cloth or rag before reassembling.
It is important to note that when cleaning a transmission pan, you should always wear protective gear, such as gloves and eye protection, and work in a well-ventilated area. Additionally, be sure to follow the instructions and warnings on any cleaning products you use.
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Frequently asked questions
You can use a combination of degreaser, brake cleaner, and rags or towels. Some people also suggest using diesel fuel, but this may leave an oily residue.
Firstly, drain the transmission fluid by removing the drain plug or loosening the bolts on one side of the pan. Then, use a razor blade to remove any gasket material stuck to the pan. Next, clean the pan with degreaser and brake cleaner, ensuring it is completely dry before reinstalling.
It is generally not recommended to use water to wash a transmission pan as it can contaminate the pan. However, some people suggest using hot water in a parts washer, which will self-dry due to the heat.
To avoid contamination, some people suggest using a paint prep product and a paper towel to clean the transmission pan. Another option is to use lacquer thinner or denatured alcohol.
It is recommended to clean your transmission pan regularly as part of proper maintenance procedures. However, the frequency of cleaning may depend on various factors, such as the condition of your vehicle and the amount of use.











































