Can you solve this problem?

Everyday the Ecowarrriors go through every worm farm bin and paper bin in the school. This is what they see everyday. They find all kinds of rubbish that do not belong in the paper or worm farm bin. Why  is this a  problem you ask?

In Brooke's words: " It takes us about 5 - 10 minutes to sort out and wastes our learning time".

Do you have any suggestions on how to solve our problem? How can we save time?