We are talking of hundreds of pots here so a hot wash would be a bit difficult. Mind even bleaching them is proving a bit difficult. 9 litres of water and 1 litre of bleach does not make a particularly deep binful. I have done about 1/3 of them so far. Then it rained so I stopped.
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https://hortnews.extension.iastate.edu/1994/3-16-1994/clean.html
9 parts water to 1 part bleach
Wisdom is not putting it in a fruit salad.