There is a product made by a Company called Betco and they use to have and disinfectant that was acid free. I will check with them. Depending upon the cleaner t upon the cleaner the customer is using could and probably is the reason the polish is so called coming off.
I would suggest taking some of her cleaner and applying it on a new piece of stone and see what effect it has then so it to the customer , if fact I would leave the stone with the customer and allow the customer to see the effect the cleaner if this is what’s happening.
John E. Freitag
The Stone and Tile School
Customers needs a non acidic disinfectant for marble bathroom floor. Wants to use Lysol because its "the only germ killer out there" and the reason that the polish is coming off is because" I did a bad job. "
Xtremeclean Tile - Boston Stone Restoration
Specialty Stone Care
"Begin with the end in mind"