Go on a roof with a Chinese Restaurant and you will see what died in the goo. Commercial Buildings are the best with the built up gravel roofs. All kinds of crap grows up there, trees, weeds, bushes, grass, cactus. Ive found bottles, cans, buckets, shoes, clothing, hats, ladies purse, tools, phones, mp3 players, CD's, cassette tapes, car radios, mops, brooms. If you can throw it on a roof and it sticks, I have probably found it. It seems like every trade that goes on a roof will leave something behind.