The piss is probably on the fiberboard bottom of the cab. Cats don't piss 4 feet up in the air to spray the outside of the cab.

You don't say what game it is, but normally you have a few triangular gussets around the edges of the bottom fiberboard.

Chisel the gussets away from the sides of the cab, and then when you stand on the fiberboard, it will flex out of the channel it sits in.

Use the old fiberboard as a template to cut a new 1/4" PLYWOOD bottom.

Use a router or chisel to remove the channel lip from 2 adjoining sides of the cab, so the new bottom can be installed.

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You can't use chemicals to "mask" the odor, because every time the humidity goes up, the piss will come back.

Wipe the rest of the inside of the cab with 50/50 bleach and water.

Set it out in the sunlight while you fabricate the new bottom, so the UV can break down any remaining odor.

Anytime I've had a really pissy cab, it was always from a cat or racoon climbing into the coindoor and spraying inside.

Great story!

If it makes you feel better, most of the 70s playfield plastics smell like feta cheese and puke combined.

I've got a pile of SBM plastics in a gallon ziploc bag that if you open to find a needed plastic, you have to hold your breath - otherwise it's chunder time.

Even the old plastics that I put into peroxide/oxyclean and set in the sun for a day, still stink when you open up the closed bag.

Old plastics simply stink.