Recommended tools to clean an engine compartment (like this 2007 Audi A4 Avant).

Recommended tools to clean an engine compartment (like this 2007 Audi A4 Avant). First, P21S Total Auto Wash. A great cleaner for the dirt and grime that accumulate on the plastic, rubber, and metal surfaces in the engine bay.

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Audi: How to Clean Your Engine Bay

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