Best way to get nail varnish out of carpet?

Is it on the carpet or the vinyl? Matters for what you put on it. Carpet: blot off as much as possible, then dab with nail varnish remover on a cotton pad, outside of the spot inwards, blotting with a dry cloth as you go. Test it in a corner first, acetone can melt some synthetic fibres. Finish with a little dish soap and water and blot dry. On vinyl click flooring I'd avoid acetone altogether, it can dull the surface. Rubbing alcohol is gentler and usually lifts fresh varnish.