I wanted to debur all the little plastic washers for the capacitive fuel senders. I started doing this with an x-acto knife which worked pretty well. You can see one that's been deburred on the left and one in it's original condition on the right. The x-acto knife method was awfully time consuming though.

...so I tried the grinder. Surprisingly this worked great. They cleaned up in about 15 seconds each. I was surprised the wheel didn't burn the plastic.