I successfully clipped off the remaining poopy fur - there wasn't much
left, and thankfully it was dried out and not too smelly. Smudge wasn't
thrilled that I was doing it, but she didn't flip out, either. She kept
trying to get away, but I was able to keep her still enough to get the
right tuft of fur and remove it.

And then I figured, since that wasn't so hard, that I'd try to clip
off lots of rear-end fur and make it much shorter. I got a lot of it.
I couldn't really tell if the fur was significantly shorter, but there
was plenty on the counter. This was on the counter next to the kitchen
sink, btw - I later wiped down the whole area with disinfectant.

Hopefully this will be the end of that problem! Thanks for the help.

Joyce