From band boosters to Boy Scouts and church groups, the IMS pays the groups to pick up trash, most of it beer cans, along with food containers, broken lawn chairs and gas grills.

"Probably (the grossest thing was) the chicken legs, just because they're half-eaten and pretty nasty," said volunteer Kelly Stoufer, who was working in the stands. "Somebody lost their lunch up there, so we'll get that last, after we get everything else finished."

But the infield was even worse. Volunteers found furniture, from a ping pong table to love seats and a futon, along with what appeared to be a makeshift toilet.

"Someone took a bucket and a toilet seat and put it on top of it and then used it as a toilet," another volunteer said. "It was completely full, too."

In years past, volunteers have collected more than 400 tons of garbage during the race season.

Track officials said they recycle what they can from what race fans leave behind.