I take the screw & washer off the left end, slide the cylinder out, wipe the inside of the body & outside of the cylinder with a paper towel & rubbing alcohol, dry, reassemble and it's ready to go the next time. A friend gave me one that had been used for black powder for years. It was frozen up and I had to drive the cylinder out with a dowel and hammer. I cleaned the parts and polished them with a Scotch Brite pad and it worked fine after I put it back together. The rust had pitted the inside of the chamber but it doesn't affect the function at all.