Well this has been an experience so far and not done yet!!! I am cleaning the unit that has had about 300-500 22lr thru it last summer and fall and was never cleaned then. I am soaking for a few days to see how that goes but I only have a few different solvents right now that do not seem to be doing much good at all. Anyway, once it is cleaned I want to try and use the best ammo possible. Wondering what ammo is the cleanest and leaves the least lead in the baffles. Do the copper wash/plated ammo such as CCI Mini-mags or some of the copper Federal's or Winchesters do any better? So far I have just put lead round nose thru it being Federal automatch, some Federal match ammo and some Lapua. I guess I never expected that much buildup inside the unit.