I'm not sure if it's actaully stained, but after I started using Kodak Polymax developer a few months ago, my developer tray started looking like there is silver residue or something in it. I didn't think too much of it until I recently noticed that this residue can come off onto my prints or my tongs. It seems to wash off of prints pretty easily in water, but I'd rather not have to worry about it getting onto the image where I won't see it until later possibly. It's easy to spot on the borders or the back.

Is this normal? Is there anyway to avoid it (other than possibly using a different developer)? Thanks.