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[Challenge-Solved!] forgot to upload before work yesterday...
(sh.itjust.works)
Let us help you identify that mysterious object you’ve found.
Currently in CHALLENGE mode: If you've got something obscure knocking about, post a picture, and let's see how we do. Please prefix such posts with "CHALLENGE:" so we know we've got a fighting chance.
It looks like a car washing sponge. It could be make reversible to it doesn't pick up abrasive particles when it is unused and left out to dry
Plot twist: It's actually really really large. You drive your car inside, and zip it. As you drive your car, the thing rolls around you and scrubs the car clean.