The only cleaning I have seen (or done) at a Cowboy match is to a black powder gun, if it gets sticky or stops. Windex breaks them loose very well, but it is said that Ballistol is excellent for the job. I now have some, but haven't shot BP yet since. Last Sunday a shooter was squirting Ballistol into the breech to free up a 73 lifter. He was shooting Black Powder.