I would think twice about using ozone on electronics. We had a landlord blast a basement once while we were out of town and it fried the controller on the furnace. It would not be difficult to remove speakers and the head unit to blast the cabinet.
Alternatively, you might want to look into having the cabinet retolexed. When my band used to gig I kept my gear stripped to the wood and varnished so when they got too beat up I would sand and reapply. Punk houses get nasty.
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