Really??
[ROFL1][ROFL3][fail][facepalm]
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Never tried with an AR, but I used brake cleaner with great success cleaning shit out of my 240L. Worked really well.
I've cleaned tools and AR's in the dishwasher before. Lots of oil after the cleaning.
...don't forget to disassemble and clean the magazine, as well.
If my "buddy" challenged me to that I would tell him to fuck himself. He can go buy his own damn AR and find out.
It's one thing to get some sand in it from the range, a class or fighting the Zombie Apocalypse but to purposely put sand in a weapon is daft.
Did the microwave thing work?
Dishwasher
Non-chlorinated brake cleaner. All over. Every part EXCEPToptics.
let dry.
compressed air to blow out the rest.
re-lube.