Lightbox
Processor Clean made by jobo.
Available from calumet photographic. Nothing better. I cleaned color and bw processing machines with it for years. Expensive but well worth it. After cleaning developer and toner tanks. Rinse with fixer. Then rinse thoroughly to get rid of any residual fixer. If you do not fix and rinse, the tanks will turn black again immediately when you "re-develop" by putting in the developer or toner...