I use a sonic cleaner. Several cans got to where they were way louder than they used to be, so in the basket they went.
Came apart fine, baffle stack went in still together, came apart in the basket. 5 or so 45 min sessions got them pretty clean, brushed the rest, still discolored.
Made sure...
You MUST have the Form 1 in hand to legally receive said solvent trap if it has holes in both ends and is threaded. ATF considers it a can.
If no drilled ends you can order as many as you like. Form 1 in hand when you drill.