Post Master General
Join Date: Apr 2012
Location: Bowling Green, VA
I Ride: '09 ZX6R
I personally would avoid the pressure washer......
The buttons between the hub and rotor provide an expansion joint to allow the rotors to expand when they get hot from braking. Iron rotor, aluminum hub, and whatever other metal the buttons are..... All with thin gaps between them, that trap moisture. Forcing more water in there is a bad idea, IMHO.
A near certainty that they will eventually corrode together and eventually bind up. If they cannot allow equal motion out, then back in when the rotor cools, that's what causes warped rotors.
Breaking the buttons free by rotating them has been described here in the past; doesn't take a lot of time, money, or specialized tools. You just need a bit and bolt that barely fit through the hole in the button so you can clamp onto just that button, and brake cleaner. Tighten enough, so that when you twist the bolt, the button follows. Soak the gaps around the button with the cleaner, to flush out whatever crud is in there. Work them one at a time, you'll know when they behave the same.
"Basic stuff fellas. Use your head for something other than to break your next fall."