Drop your calipers off yours forx,pads out,lines attached,into a bucket of red hot water with a washing up tablet in,or a handfull of washing up powder,leave for 10 minutes then thoroughley clean with a alloy wheel brush,or toothbrush or similar,then blow dry dry with an air line,or similar,then smear a small amount of brembo silicone caliper grease around then exposed pistons,its available from GPR,for about a fiver,do this 2/3 times a year,replace as removed,torque up,job done !
Do not use brake cleaner,as it perishes the seals,its ok on pads etc,but not the calipers !