I just found some gun scrubber cleaner spray at Walmart for $8 bucks so I bought some. Everyone else is way too expensive.
I've been known to use Rem Oil that way also. When I sprayed the Rem Oil in (very wet) I then come back and use "canned air" to blow the excess out, wipe it down, then Good To Go.I like brake clean for stripping all the oil and grease off parts and screws for gaskets and locktighting. To clean brake parts I use water.
If I got a gun that needs flushed out I use rem oil
Non Chlorinated Brake Cleaner works great, will not cause rust, will not melt "plastic" guns, evaporates fast. As with any cleaner you should be careful with it.I've had bad results with break cleaner, it can rust your metal in a nano second, so be very careful when using it if you have to use, and wipe you piece clean with a paper towel, then oil well...a good cleaner wont rust your metal, break cleaner is at the bottom for quality when it comes to cleaning guns or any metal of value, just a heads up....