Dishwasher is a go. I have done it to many Garands, Carbines and Thompsons. I stripped them down and put all the springs and screws in a marked tub and then put all the big hardware, stocks, forearms, receiver, barrel, you name it, in the dishwasher. I don't use any detergent and turn it on heavy wash. I remove everything before it goes to dry cycle and then out to the air compressor and dry everything but the wood off. I allow the wood to air dry for 3 or 4 days and then re-apply the linseed oil. It takes out dents and lots of other things, I never had one crack on me.
So yes throw your stuff in the dishwasher especially since it's plastic, it won't hurt anything.
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