Quote Originally Posted by John Forish View Post
I wouldn't use them on any fly line. There is definitely abrasives in them. We used them to clean some walls one time, after we were done, when the light hit them right they looked like they had been sanded.
That's kind of what I suspected especially seeing how it cleaned the pond scum off my jon boat. I've always cleaned mine in a sink using Ivory soap, then rinsing and drying.