I believe it happens with most (if not all) dev. I've been using Ilford and at school we use Kodak and yes the trays get like that after a lot of use.Originally Posted by David Ruby
I have seen formulas for cleaning this off. I think it was in the "Darkroom Cookbook". A handy book to have around. If not posted by the time I get home tonight, Ill dig it out and "pm" it to you.
Some else here may have the info on hand