I bought a number packages of this 25 years ago and this is the last one I have.

Just 10 years ago, I bought a package of Kleen Bore Lead Away Patches that came in a blister pack - from Wholesale Sports in Calgary, Alberta.

They are around here somewhere, mostly unused as I've found what works to eliminate leading that sticks in the bore.

This stuff is, as I noted, scary in the way it removes lead- streaks and chunks of lead on the cloth when it comes out the muzzle - amazing. Perhaps it's not allowed any more due to contents, I don't know. Good if it's still available, though and a check with Kleen Bore will answer that.