Don't clean it, don't mess with it, don't worry about it.
I know, it's bizarre, when I first got into ARs after many years of cleaning other rifles, it felt wrong to just leave it be, but that's what you do. The AR gas system, as I understand it, operates at higher pressures than a lot of other types of gas-operated designs. Crud, solvent, lube, very small squirrels, and anything else that may get in there will be blasted out of the block and tube on firing.