I have taken a few newbies caching with me. Dad's with kids, Our first cache was a DNF...but lots of trash, I pulled out my walmart bags and handed them to everyone with me. All I say is if you go in caching you come out with trash. The boys that were with us are 8 and 10...they picked up basic trash, not anything that looks dangerous. You need to help teach, and areas may not clean up that day but the future will continue to clean areas.
We did 8 caches today, one DNF...6 walmart bags and one dog poop bag full of trash....I gave one of the boy a dog poop bag because he saw a bunch of garbage right NEXT to a cache and wanted to get it and I ran out of walmart bags. You don't have to remove everything but any little thing does help.
AND...YOU ARE NEVER FORCED TO LITTER...that was just a poor thing to say
CITO
Jack