I bought 5 yards a long time ago at Joanns. Never have washed it. Cut it on a cutting board into strips with one of those wheel type cloth cutters, layed the strips in a fry pan of hot crisco then took it out to drip an lay on a cookie sheet. Today I just useplain pure bees wax. Laythe strip on the muzzle start the ball to flush and use a patch knife to cut it flush and then finish loading the ball.
I have also have used old blue jean paint legsdid the same.
Al