HowToCleanStuff.net has a surprising variety of user-submitted cleaning tips, getting into the nitty-gritty of cleaning gunky watch wristbands, literally everything that falls on carpet, and more. The bonus? Each submission is a small charity donation.
It's only 25 cents to the Clean Water Fund, but given how quickly these kinds of tips can accumulate on a user-generated site like this, especially one that seems pretty well organized, those micro-payments add up over time—the tally was $US474 as of this writing.
From a purely practical standpoint, HowToCleanStuff.net is a good place to go and search out your rarest, weirdest cleaning questions, or just whatever your dirty house requires. Wondering what's the best way to scrub down a Wii Fit balance board? Yeah, it's got that covered. Free to use, no sign-up required.