First time using this stuff. I usually clean small parts in a plastic bin over a plastic sheet. This stuff ate right through the bin in about 20 minutes, then through the plastic sheet. Acted more like acid. Turned the black plastic to putty. Still didn't get all the lead residue off my Sparrow suppressor clamshells though. May need to use a vinegar/Hydrogen Peroxide dip now, although I don't want to deal with a toxic brew. Kroil must be great at getting metal parts to break loose, it sure does penetrate. Will use a glass container from now on. At least I placed it outdoors due to the smell and not on my workbench.