This will happen regardless of the developer used. There was a tray cleaner available in the UK but I think the company went bust. I had a cleaner made up for me many years ago that contained sulphuric acid, hydrochloric acid and another chemical that I've forgotten and I'm still using it. I've also used ordinary household bleach and after washing the residue away I placed some used fixer in the tray, after swirling it around the tray I washed it again. This was necessary to prevent the tray from staining immediately when I next filled it with developer.