On the theory that prevention is more effective than cure, I have always
washed my tanks and trays after each use in hot water, rubbing gently
with a sponge. Then a hot water rinse. So I have never been troubled by
residue.

If they were new tanks and reels, just wash them in hot water and use a
sponge on them. My guess is that you would probably get away with just
using new items without washing them, but I have never risked that.

I suppose if you insist on chemical cleaning agents, a product called
_Alconox_ would be the way to go for new equipment. You could probably
use it every day if you do not mind dumping that stuff down the drain
all the time. As I said, I have found hot water does the job if used
immediately after processing.

http://www.alconox.com/static/section_top/gen_catalog.asp

For used equipment that looks OK to the eye, that might be enough. If
there is obvious black staining that will not come off with hot water,
or even Alconox, then you may need to use specially compounded reagents
to remove silver deposits, etc. Kodak's TC-1 or TC-3 might be required.
You mix these up yourselves. You want to be careful with those. One of
the ingredients is concentrated sulphuric acid

Trad;

There is a company by the name of Photographic solutions that makes a
product by the name of photofinish. This stuff works wonders and is
totaly safe.

Later Nolan

Both Kodak and Edwal make (made?) tray cleaners. See if you can buy a
bottle.