Excellent! non-petroleum cleaner - Ballistol Multi-Purpose Liquid Cans

Excellent cleaner and metal preservative for air guns and firearms. I use this in both being a synthetic-based CLP (cleaner, lubricant, preservative)
Being a non-petroleum product, it is a perfect for air guns being that it does not deteriorate or dry out rubber or nylon seals and o-rings.
For firearms, it also is an excellent cleaner. I use it as a last and final step in the cleaning of my firearms.
It does not affect finishes on metal whether black nitrate, bluing or other such finishes. Whether polycarbonate, nylon, fiberglass or even wood should not be affected by the cleaner.
I use it as my mainstay cleaner, lubricant and it leaves a preservative coating to resist rust and corrosion on metal.
A definite recommended buy!