Acetone is really quite strong. Try more like 24 seconds!
Only put metal models into acetone, as it WILL melt plastic and resin, even a quick dip will melt details.
What I've done before is to drop the (metal) model into a small pot of acetone and (with rubber gloves on) immediately scrub the model down with an old tooth brush. Maybe 60 seconds later my model is relatively clean and just needs a quick rinse with some fresh acetone before being blasted dry with compressed air.
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