If you have the cartridge, surely job is almost done, or at least worth trying at this point? To be honest, they probably aren't that dirty where the rubber seals were, assuming the rubber seals (O rings) came out in one piece. I'd be inclined to check for dirt and if it looks kind of alright, just push the new cartridges in with some silicone grease.
I sense an unexplained change of plan?
Vinegar works quite well as a descaler, but I'm with Yorkshire on this to some degree in that, if the brass is poor quality, then you may do more harm than good.
I sense an unexplained change of plan?
Vinegar works quite well as a descaler, but I'm with Yorkshire on this to some degree in that, if the brass is poor quality, then you may do more harm than good.