I definitely DO on both of mine !
Besides a short cut around the anal opening, I extend that to shortening the hair for about 1/4-1/2" out on their tails as well. Then, taper the longer hair as it approaches the body. With that, I rarely have any debris stuck back there.
But, the above process doesn't prevent it totally. Now an then I find something that needs to be removed, and just pick them up, set their back legs in the sink (after warming up the water) and give everything back there a good rinse. I don't get grossed out at doing it bare handed.
Both mine seem to enjoy the rinse, I think they like knowing they're nice and clean.