My quick tip that maybe someone else might appreciate as much as I did, is simple, and I'm sure, unoriginal. I pretty much keep a handy "magnet on a stick" whenever I am working under the hood. It’s inevitable that something will drop in the hood and you have to get the long reaching magnet out to retrieve a bolt or socket or who knows what. Well, one of the things that I can't hardly stand is the fine crust metal powder that’s always stuck to the magnet. If you’re grinding metal or welding, or brushing rusty metal, you have it around.