Wheel treatment ensures cleanness and gloss for a long time.
Regular care for wheels helps you to preserve their original appearance, reduces contamination caused by friction of the disc brakes and simplifies significantly washing of the wheels.
Otherwise the dust generated from the friction of the brake pads and discs and reagents sprayed on the roads can eat off the coating of the wheel. This process is practically not reversible.
Recommendation: treat the alloy wheels from outside and inside twice per year and the allow wheels will look as new even after you have left many thousands kilometers behind you.