I drive an electric vehicle and the unfortunate reality is, that brakes that are large enough for an emergency stop get underutilized during everyday, regenerative braking. So they rust.
My solution is: Every time I get back to our village in wet weather, I accelerate hard on the last long straight and brake hard to almost a standstill once. No more brake trouble, all four rotors squeaky clean, but any measuring device would write me up as the biggest idiot on the roads out there.