Bleach is also very good for cleaning the developing slot so long as you are not in a hurry. The last time I used it I filled a 50/50 solution and left it for a week when I was away in Europe in June 1919 (Seems like a lifetime a ago now!)
But when I came back the slot was a lot cleaner than I left it. IOt needs doing again.
Bleach does loose it chemical activity after a short while so perhaps once every 3 months is a good interval.
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