Unbleached #2 coffee filters, accidentally purchased for use in a #4 machine: useless.
Unbleached #2 coffee filters, for refreshing, through removal of suspended particulates and other gunk, the citrus solvent you just used to leave your chain spotless: perfect.
And by “chain”, you mean the one with which you suspend your gold pimp medallion, right?
Of course. Gotta keep it clean, after all. Can’t have oily grime and metal shavings befouling my lush, immaculately-groomed mat of chest hair.