Hey Jeff, the car wash works-the last time I tried I got several rings (most junk-1 gold) about $25 in change, and 1 $5 bill. This came out of 3 30 gal trash cans I took w/me. It's great if you have 3-72 inches of snow on the ground, just sift it in the garage cause the stink can be real bad. Also be sure to wear gloves-lots of broken window glass shows up in those. BE SURE to use a screwdriver to stir the stuff around cause there might be NASTY NEEDLES!