I'm this --> <-- close to buying some for my dirtbikes. It's a PAIN to have to buy a small $4 paper filter every oil change.(it's annoying when that oil change comes after every 2nd ride)
As for cleaning, I've read you can take an airhose to em and blow em out on a rag or something. I think all you really need to see is if there's any major metal or debris in it. The old film of oil shouldn't hurt, since technically you don't drain every once out of the motor anyway.
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