How to Clean an Audi Engine Compartment

1. Allow the vehicle to cool completely before you start to wash the engine bay. If the engine is up to temperature and cold water is sprayed on it, the rapid cooling of the metal block may cause it to crack.
2. Cover all of the electrical components in the engine bay with the plastic wrap and tape them off using the masking tape. You want to try to cover these items so they don't get water in them and potentially short out when the vehicle is started. It's not critical that each piece is sealed completely from the water, but this will definitely help in the process.
3. Spray the degreaser liberally all over the engine, making sure to really soak the engine with the cleaner as this will loosen up the dirt and grime on the engine.
4. Scrub the engine using the scrubbing brush, breaking up any dirt or grime that you find along the way. This is the longest step in the process and can take some time depending on the level of filth under the hood.
5. Adjust the pressure washer so that it puts out a 3-inch wide spray. Pull the trigger and hose down the engine compartment, keeping the nozzle about 3 feet away from the engine at first then moving closer as you work.
6. Remove all of the plastic and masking tape from the engine bay manually.
7. Allow the engine to air-dry for at least an hour before you drive the vehicle, or you can use a microfiber towel to dry it if need be.