Vinyl flooring is made of a thin layer of plastic, with a tough surface of the vinyl. The surface of vinyl flooring is very smooth and has a non-porous property. This can prevent alcohol from absorbing and staining the flooring. Loose alcohol evaporates quickly because of the material. These two properties of vinyl flooring are the reasons why rubbing alcohol does not damage it. But the cleaning of vinyl flooring should be done with soap, not rubbing alcohol. Use a towel or a sponge to clean, but not a paper towel because it may have a lot of fibers that will scratch the floor. So rubbing alcohol only damages the vinyl surface when it's used to clean the floor.