How deep are the grooves? The axle wiill show wear marks discoloration but if your feeling grooves I would replace the axle and seals. How deep would you say the grooves are?
I have wear marks by seeing the different tones of metal but smooth all throughout the axle @ 12K
Are you cleaning everything axle, brake caliper, bushings seals, bearings to where you would eat off of it and properly lubing it when putting it back together?
Break cleaner clean lint free rags and approved grease??