Hi there! Sounds like youve done a good cleaning job on the outside. However, if you remove each caliper in turn and take out the pads etc and clean up everything including anti-squeal shims,pivot pins etc-make sure you put a thin layer of copper grease on the back of the pads-also on the pins-this will probably cure the problem. While you have the pads out-clean around the pistons with brake cleaner and lube the visible part of pistons with red rubber brake grease-dont use any other type of grease-it will damage the seals. You may have to pump the pistons out SLIGHTLY to access any old dirt,grease and brake dust. Also clean out any grooves on the front of the pads-they often harbour muck-and while youre at it just make sure there are no small stones or grit embedded in the lining material. Fazer brakes are good but need regular cleaning to get the best outof them. Good luck!
Hang on a minute, I was told not to use brake cleaner as it rots the caliper seals.I used hand wash, warm water, a toothbrush and elbow grease to clean mine up.