This happened to me literally after my bathroom was complete. I was moving all of the stuff back in, and I too dropped a bottle of hot pink nail polish. I called my dad right away as he is the one who did the remodeling. He brought over some paint thinner. I used that & cotton balls & it took it off! I suppose if you have acetone, that would work as well. I did use an old toothbrush dipped in the paint thinner & cleaned the grout that was affected. It did not harm the grout at all but we may have different kinds. I hope cleanup is a breeze for you. After I was done freaking out, mine took no time to clean up!