Cheers!
The outside of the pistons have a few marks as well
I'd probably reuse them if it werent such a vital safety part
I'll try some 3-in-1 overnight and try again tomorrow.
The other caliper is in Gunk now with seals in still...if I take them out now would they be ok to reuse?
No dishwasher, I'll have to do it the old fashioned way