From DW:

The Duty finish is the most durable finish on the market, however harsh cleaners will discolor it. The protection will still be there but you could cause streaking. There are literally hundreds of cleaners and oils on the market and more being produced every day. There is no way for us to test everything and that is why we only recommend a few that we know will work and work well. It is very important to stay away from strippers and degreasers. Generally, if it is safe for polymers and Painted pieces it will not discolor the Duty Treat, these are usually oil based cleaners.

We recommend, FP-10 , Miltec-1 and TW25b grease for the rails. These are the only products we recommend to grease the rails.

Kroil will work as a cleaner and bench rest shooters have used it for years. You may have to let it soak as it is penetrating oil. We recommend FP-10 as a kind of a do all, lubricant, cleaner and surface protectant. Any light gun oil should work as a surface protectant as well.

Don’t get overly concerned with having the gun spotless. Generally a good wipe down and maybe a little scrubbing with a toothbrush and cotton swab every 500 rounds is all that is really needed. Keep the rails and barrel hood good and wet and the gun should treat you just fine.

EDIT//never use a chemical solvent or degreaser, products with Trichloroethylene, Ammoniated Solvents, or strong Alkaline Solvents, Gun Scrubber or brake/carburetor cleaners

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