Please correct the errors, im not sure on this one.
The scouts or their mascot must do their best to clean up the mess at the campgrounds.
3 answers
How can you rephrase to get rid of the second 'their'?
The scouts of their mascot must do his or her best to clean up the mess at the campground.
No, that doesn't work. The original is better than the "his or her" sentence.