I have re used them a little bit too. Found the hot water/dish soap and shaking vigirously mostly works. But I did notice a little blowback from the "reloads" on my Wolverine 209. Might not be an issue on a Disc Elite or similar, but on my plunger gun, I definitely noticed some blowback. I hang on to them still, but have bought several hundred of them so that I don't have to re use them unless it is an emergency.