It cleans inside the rollers really well. Soak a 4" spot on a nappy towel, grip the chain firmly enough to spin the rollers, and rotate it. Do it until you hardly have any solvent left. Maybe a second time if the chain is fairly dirty. Then several times with dry parts of the towel. With solvent on Pro Link, it spins it right out of there. You can see the gunk diminish on the towel as you keep doing it.

It's quick and easy, so doing it regularly is a breeze. Not letting your chain get totally groadie is what makes it work. bk