Take a simple 6 inch black nylon zip tie. They have notches on one side that work great at catching and removing dirt.
Just wrap it around the piston, take up the slack, and give it a couple quick turns, and your pistons are clean and shiny again!
I use this method with Windex, simple green, or brake fluid. Not nearly as messy as a tooth brush, and cleans better.
If you dip the tie in the cleaner first, the solution stays on the tie and does not get all over the caliper like spraying or brushing does.
Clean, quick, and re-usable, and everyone has 'em in their tool box.
.02
Just wrap it around the piston, take up the slack, and give it a couple quick turns, and your pistons are clean and shiny again!
I use this method with Windex, simple green, or brake fluid. Not nearly as messy as a tooth brush, and cleans better.
If you dip the tie in the cleaner first, the solution stays on the tie and does not get all over the caliper like spraying or brushing does.
Clean, quick, and re-usable, and everyone has 'em in their tool box.
.02