Without anyplace in my area that will or "likes to" turn rotors anymore, that has become a thing of the past in my area.
I just buy new rotors.
I will share in case it helps...
My shocks are so bad now (165,000 miles, and the factory stock as far as I know and guess) that I got bad wheel hop when braking anywhere near hard.
The hop is felt through the steering wheel too and could have some thinking it is warped rotor or just the brakes.
I actually need all of the above, but in case you don't seem to find cause and fix, keep the shocks in mind.