I recently found a cache that was well hidden but also surrounded with tons of garbage and debris that had obviously blown in from the nearby road- I hit the webs and found this site: http://www.geocaching.com/cito/

CITO stands for "Cache In/ Trash Out" These CITO events are organzied events but it stresses the importance of practicing CITO each time we cache. I plan on packing a pair of gloves and a trash bag in my car so that I am prepared to do my part each time I am enjoying the outdoors. I wanted to pass this idea along!If you are a go-getter maybe you could even organize an event in your area!
Happy caching!