Cleaning engine from dust

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Blow off the loose stuf then get a can of brake clean from the auto store spray the sh_t out of it till its clean it doesn't leave a residue.:D
 
Thats effective except the residue left behind from the wd-40 may discolor the metal when the engine gets hot.
 
I personally would use Simply Green sprayed on the engine and then rinsed off taking care not to get anything inside the engine. Blow dry with air and you're done. This will also take off the WD-40 residue as well.
 
Carb or brake cleaner in a rattle can. No residue and dries quickly.
 
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