The great thing about hoppes is that I still have a bottle that my dad had from high school and I went and bought another bottle a few months ago and the only difference in the bottle was that the old bottle was glass and the new one was plastic. It has literally been the same for over 30 years. Everyone I know around here uses it and it works pretty well but be warned if you clean your guns inside open some major windows. You think Bleach smells bad, this stuff will put you on your butt quick, its strong lol