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Are ultrasonic cleaners a meme when it comes to "deep cleaning" an airbrush? I only use lacquer paints, and I'm sure there's some hardened Mr.color paint that's accumulated somewhere on the airbrush (there's some in the feed cup that's stubborn as hell). I'm afraid to submerge the entire brush into lacquer solvent cause I'm pretty sure the o-rings on my iwata brush can't handle it. I did buy replacement o-rings, but not for the air valve body which I can't unscrew. what do