Never thought of using the piston to help out like that.Great idea. Break free, gunscrubber, or *gasp* el-cheapo brand non-chlorinated brake cleaner works great on ALL tough and/or organic stuff, and is easy to get in harder/smaller places since it just sprays in. Cant picture how lone or big around the sks gas tube is ( never cleaned either of mine), but pipe cleanes, a .22lr cleaning rod with patches, Q-tips etc would work too. (again, all depending on length and diameter). Dr. Peter Venkman's idea may still be the best and easiest though.no idea.Spray the inside of it with Breakfree and Gunscrubber. Then, take a very thin cloth (at least as thing as a napkin) or heck even a napkin, and stuff it in the fat end of the tube. Take the piston and ram it in, then do the reverse on the small side and push it back out. Do the same for the smaller part of the tube with a smaller cloth/napkin.
Use a 12 ga shotgun brush with a patch wrapped around it.
I want a spotless gas tube
Cleaning an SKS after every range session? Wow. I think I've cleaned mine. Once. Maybe.