This is the stuff that I'm close to buying. It's expensive though, so if it's not going to work at all I'd almost rather just pay a pro: https://www.amazon.com/gp/product/B0193ZEJGI?pf_rd_r=0X10CMAX9VK43T585R5Z&pf_rd_p=edaba0ee-c2fe-4124-9f5d-b31d6b1bfbee

As far as a "before" photo, I tried to take one but it's difficult to really capture the difference with a camera. But in an attempt to describe it, the unaffected tile has a mirror-like finish to it. The tile that was hit with the cleaner almost looks like someone took a fine grit sandpaper and dulled it.