be sure to use a CLEAN SOFT cloth.
Your tshirt does not fit into that catagory, neither do the towels in the public restroom, or at the gas pump.
I learned the hard way, wrecked my first mirrored one on my old HJC.
With my new Shoei, I just went with a dark smoke, ppl still can't see in, and a lot easier to take care of.
they make the one i posted in a strap on version