All I know is my father moved to Arizona where there is not much bird hunting, unless you count quail, dove, and snipe. He hadn't cleaned his Browning superpose in 40 years. The gun was leaded up something fierce, and breakfree took that lead out in no time at all. I had grey sludge flowing out of both barrels, and all over the newspaper. I prefer to clean with Breakfree, and then store with Ballistol. M Pro7 cleaner melted the grips off a couple of new old stock Beretta mouseguns, so that garbage only gets used on certain guns. Breakfree won't melt plastics. It actually makes vinyls look pretty nice. Glocks are Nylon. Nylon 6, with 30% glass fiber if memory serves. There is also Nylon 66, and Zytel a blend of Nylon 6 & 66. I usually lube with Tetra or Slip, or a budget blend of 0W20 and Wahl Oil for hair clippers, on range day. The Valvoline 0W20 & Wahl mixture is going to be wiped away anyway. If it's below 0 I will to straight to Tetra and nothing else.