If it has dried, you may be able to simply scrape it off with your fingers or a blunt butter knife (taking care not to scratch your flooring with the serrated edge). In some cases nail polish remover containing acetone is fine, but don't leave it to penetrate into your floor covering.
"You can use nail polish remover on your ceramic tile as long as you don’t leave it on for too long," says Fernando Garcia-Mantilla, co-owner of JDog Carpet & Floor Care.
"Simply scrub the polish spill with your remover and dry the area. Then, wash with water or a good tile cleaner a couple of times to ensure there isn’t any lingering chemical."
Make sure to check the type of tile your flooring is made of before applying any treatments. "Like any flooring, the type of tile does matter for how you treat it. For ceramic tile, acetone nail polish remover will be okay. However, stone tiles that have not been sealed, some porcelain tiles, porous soapstone, granite tiles, and marble tiles can experience problems with the use of nail polish remover or nail polish that gets stuck in the cracks," says Garcia-Mantilla.
"For these sensitive surfaces, you can wash the area using a soft-bristled brush with a solution of washing powder or detergent and water. Then, rinse with clear water and allow to dry."