sticks makes sense...but smooth stones? not sure about you, but it would take several dozen smooth stones. unless of course they are huge, but then...try lifting them to wipe?! or do you just hoover + 'wipe' over one large smooth stone leaving a racing stripe?

but sticks, as well as corn cobs, work just fine. i guess the smooth stones idea is where people got the 'just use a dollar...but i only had 4 quarters' ass wiping joke.