So the Sealy piston removal pliers arrived yesterday and I did my right-hand caliper today. I ended up using the rag-strip technique to clean the pistons all round (gave up using a brush as the rag worked better all-round), then pushed the pistons outs a bit to get to the strips that were hidden inside the caliper but outside of the seals, if you see what I mean. I then buffed up the bits of the pistons that I could see and then used to pliers to turn them round to buff up the bits of the pistons that had been hidden in the small-clearance section. Happy with that - I could see the pistons were in good condition and shiny-clean all round before I pushed them back in.
Cheers robbo - top bit of kit.
Cheers robbo - top bit of kit.