weird build up and streaking on prints color darkroom

I have been having an issue with my Colex processor. There is a significant amount of build up. it rubs off and we changed the water filter to see if it was calcium build up and it didn't seem to be the case .....
we reguraly clean and service the rollers. perhaps its a dryer issue or there is a substance on one of the rollers that is causing it ? images of the problem below

the part where it is really white are from me smearing the white build up with a rag. so it isn't that heavy but you can see the problem well by looking at the corners.

Hm. Any chance your blix is exhausted/breaking up and the deposit you see is on the prints is sulphur? Check the rubber rollers and cogs of the blix rack for the same white smear. I don't think calcium should give you such problems.