S.B.
I have a son who is obsessed with the garbage truck and recycling truck. He is almost six and has had this obsession since he was one. Between his demanded google searches, the kid shows and the documentaries I have been subjected to, I feel like a trash expert. :) The dirty stuff will get recycled. The containers have to be washed and labels removed on site, so that last bit of peanut butter will get out of the jar without you wasting gallons of water to clean it. Plastics and glass are subjected to high heat, so organic material is often burned up, the muck left behind doesn't hider the process. Paper is is cleaned using water. This is why you can't recycle pizza boxes, the organic matter stays around and can contaminate the recycling batch. They do have people sorting out non recycleables. It slows down the process and some items can gum up machines if they are missed (but I think this is very rare).