Yeah they were pretty bad tbh. I've removed all the seals and given the calipers a good scrubbing, will go over them again with brake cleaner tomorrow, got some muc-off stuff. What's best to clean off the small remaining bits of crud on the pistons? They're a million times cleaner than they were now, just need a finishing clean. Also, anywhere that sells red-rubber grease on the high street? f I can find the correct one from powerhouse I'll order a brake seal kit, but I'm gonna try my local honda bike dealer tomorrow anyway in case they keep the seals in stock as I'll pick up a set of OEM brake pads from them.