Keep the engine compartment free of dirt and grime to better help you detect leaks. A clean engine will run cooler and is also easier to repair. On average, washing the engine every 90 days is a suitable maintenance schedule.

To remove grease and grime, use a non-abrasive cleaner such as 'Simple Green' or 'Engine Bright Foam Degreaser by GUNK.' Do not use solvent. You will also need cleaning rags, paper towels, a soft bristle brush and hand mitt or sponge that is different from those used to wash the coach exterior and wheel wells.

A small stepladder may help you to better access the engine compartment from the outside. While washing the engine remove all metal jewelry, wear eye protection and be cautious of belt buckles, zippers or metal rivets on pockets that can scratch painted surfaces they may come in contact with. When accessing the engine from inside, carefully cover surrounding floor space and furniture to guard against exposure to grease. Before you begin, remove the ignition key to prevent anyone from accidentally starting the engine.

Clean the engine when it is cool to the touch. Tape off the vent on top of the transmission and avoid direct spraying on the transmission output seal. While spraying the cleaning agent use caution around electrical connections, electronic control units or the rear run box. In some instances it may be necessary to spray the cleaning agent onto a rag and wipe around these delicate areas. Allow the solution to sit for 30 minutes.

If you are accessing the engine from inside the motor home, wipe away the cleaning agent using paper towels or cleaning rags.

Outside access can be rinsed away using a low-pressure water hose. Do not use a pressure washer to rinse the engine and risk loosening hoses and weakening seals. The soft brush can be used to remove stubborn build up. Don't forget to clean the engine door interior.

After cleaning inspect the air filter minder. Do not attempt to recycle the filter by shaking the canister or applying air pressure to remove debris. This will only dislodge particles that can invade the engine. Follow the engine manufacturer's recommendations for filter changing intervals.

Once finished cleaning the engine, take a short drive to air blow all the components dry. Regularly inspect the engine for any evidence of oil or fluid leaks, loose hoses or worn belts.