I've been having some problems with RA4 printing that I've never had before. I'm using a Nova 4-slot heated processor, Tetenal RA4 chemicals and Fuji Crystal Archive paper, at 22C. First, I noticed that there were what seemed to be cyan 'splash marks' appearing at various locations on the surface of the print, so decided to give the tank slots a good clean in case there was contamination of some sort. I soaked the slots in a dilute solution of household bleach for 24 hours (others seem to have tried this with no apparent problems). The top of the developer slot still looked rather mucky so I tried some Muc-Off bike cleaning spray (a biodegradable alkaline solution - perhaps similar to Nova Tarbuster) that seemed to work well. After many rinses and standing with fresh water in the slots for 24 hours, I then drained the slots and re-filled with the existing chemicals - maybe not the best idea. Now I find that the prints are almost completely white but with a pale yellow image discernable in the darker parts. There are also still marks that look similar in shape to the 'cyan splashes' that I had previously, except this time they are pale yellow. Does anybody else have any experience of this, or know what might be going on? :confused: All advice gratefully received! Thanks, Edward.