There are a few things you can do to clean a nitro rc car. The first is to remove all of the oil and grease from the surfaces. This will help to prevent any build-up and make the car more efficient. Next, use a mild soap and water solution to clean the inside of the car. Make sure to get all of the dirt, dust, and other debris off of the surfaces. Finally, use a dry cloth or paper towel to clean any areas that have been affected by oil or grease.