How To Clean A Muzzle Brake

Soak in CLR, and a brush, but honestly I have never seen a dirty break affect accuracy. I’m not an extremely high volume shooter though, is this just for aesthetic purposes?
 
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These products, like lemishine, have lemon (citric acid) in them. Depending on how much you use and/or how long you leave the brake to soak in the cleaner, it can discolor the metal finish.
That being said, I have never had that happen and the people that have, say it's just on the surface and can be buffed out using a cleaner like windex that neutralizes the acid.
For me personally, I'm not at all worried about a slight discoloration of my muzzle brake. It still functions perfectly.
 
I use an 8:1 solution of water and Simple Green in an ultrasonic cleaner. It does ok.

I threw my whole upper in it last weekend. Worked great for carbon on the bolt and bcg, but the suppressor adapter still needs some work.

For a brake, I think it would do well as a brake doesn't collect as much carbon as the adapter.
 
I soak in straight CLR for stainless brakes. anything coated ill use a carb and choke cleaner... never thought of simple green and a ultrasonic. interesting.

CLR soak and the thing is back to brand new with a rinse from the sink blaster...

CLR soak on anything coated ive done has turned the finish to a pinkish color.
 
I soak my hellfire in a cup of CLR. Turns the carbon to goo. I had one that was really bad tried a bunch of different stuff CLR worked like nothing I had ever seen before. Yes the pink is copper and any kind copper cleaner will take it off