mold on wooden press slats

Rob

not a fun situation there.

If the wood slats are varnished, then surface scrub with potash (potbuttium hydroxide) will probably be enough. If bare wood or oiled wood, then spores will be into the wood, and you'll probably have to boil the wood in chemical solution to kill the deeper spores.

I'd prefer not to do a bleach-soap scrub like one does on houses, because of potential for TCA formation. See above for my first choice if you have to boil (potash). Another good fungus attacker is super shock non-chlorine-non-bromine cleaner like used for spa tubs. Could also boil in peroxycarb (blend of sodium carbonate and sodium percarbonate) or lye (sodium hydroxide). I prefer to minimize sodium-based cleaners on wood exposed to the wine. Peracetic acid also good strong cleaner and doesn't contain sodium.

Prolonged ozone exposure will do it too, but you'd not do that in an enclosed place like ur house or garage.

All the above require care for your safety.

UV lamps will kill surface mold too, but may not catch all the spores in the wood.

When you are done killing the mold, you'll probably want to condition any bare wood surface; grapeseed oil is good for that. The mold killing will have aged the wood surface.

What other good treatments have others to offer?

Gene

P.S. in the future you might think about sun-drying your press after washing, so you don't put it away damp.