So you are the one I am cleaning after with all different funky colored targets/trash!
I always do a clean up after shooting at local BLM shooting spots and use plinking targets that are easy to clean up which do not leave any lasting mark.
I use small water bottles/aluminum soda cans at 25/50 yards and 2 liter bottles at 75/100 yards. I also use PVC/wooden stands to hang targets so they become reactive moving targets not needing reset. When I am shooting for accuracy/groups, it's cardboard backing with taped copy paper targets with 1" grid squares -
https://www.thehighroad.org/index.php?resources/inch-square-grid.22/
After shooting, all brass cases are picked up for reloading and steel cases/trash put into separate bag/box for disposal. Local Sheriff Deputies/Forest Rangers comment on how well the shooters pick up trash and appreciate the clean up efforts of shooting areas. One time, I arrived at the shooting area filled with trash and shotgun shells leftover from shooting and when I started picking up trash, several cars/trucks stopped to help me clean up and within 20 minutes, the shooting area was spotless. No, I did not know any of the strangers who stopped to help.