Last night I was doing a product shot for an eBay listing of a black case that had been sitting around collecting dust for a while (hence the eBay listing). I used a normal dust cloth first to try to get the dust off it, and that removed a lot, but left trails of the dust behind that looked like scratches. It also generated bunch of static electricity that attracted all the cat hair in a 3' radius. So next I tried a damp towel, but that left bits of lint behind. In a moment of insanity/desperation/inspiration I grabbed a kandoo wipe. (For those not familiar, they're toddler bathroom training wipes... sort of in between baby wipes and toilet paper.) It worked perfectly! No dust left, no lint left, no cat hair left, and no static electricity generated. Now I'd never think to use one on my camera, but when it comes to wiping down black plastic objects for product shots... appears to be a winner!
That got me wondering what unusual/unlikely household items others have put to photographic purpose?
(Let's Comunity wiki this... say one item per reply?)