I acquired a stack of used plastic trays yesterday. None of them are labeled specifically as Dev, Stop, Fix, etc. and they are crusty. The guy I got them from mentioned that he hasn't done darkroom work in about 5 years, so I'm assuming that crust has been sitting on them for quite a long time. I'm a bit concerned about contamination, is there a good way clean the trays so I don't need to worry about contaminating my working chemicals? Would distilled water draw chemicals out of the plastic? I have some darkroom soap, it's kind of gritty, but beyond that I'm not really sure it does anything different than regular soap.

Is this something to be concerned about, or should I just scrub the hell out of them and not worry about it?


Thanks,
Adam