Tray Cleaner 1 (TC1)
1L water
90gr Pot. Bichromate
96ml Sulfuric acid, concentrated.
I've used it fillling trays, slots, or just scrubbing with a brush soaked in it. Then rinse. Use protection (gloves, lab coat, eye protection) and common sense from mixing properly to use; you don't want the stuff splashing everywhere, isn't healthy and – ironically – it stains. On a glass stoppered bottle it lasts nearly forever, I keep using the same solution for longer than I can recall.
TC3 is less aggressive, and still a good cleaner in two solutions, but I don't have the formula at hand. IIRC it had sulfuric acid, and pot. permanganate in a far lower concentration.
Jobo processor clean does the trick too, but ain't cheap, probably in the same league than Nova's. Also there is – or was – a third product from tetenal, but can't tell you about the price.
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