Itâs a new must-have on the tray of every hair colorist â PRO Color Stain Barrier and Remover is a non-greasy, fragrance-free all-in-one formula that doubles as a pre-color treatment to prevent stains before they happen and a post-color treatment to effectively eliminate stains. Before color, simply massage in the clear, gel-like solution at the hairline. Itâs easily applied with fingertips and wonât affect root coloring. For stains where you may have missed a spot, dab some gel on a dry towel and swipe gently. PRO is also an effective stain remover on all fabrics and hard surfaces â so you can use it on clientsâ clothes or robes, stylistsâ aprons, on the backbar, on salon towels and in the sink.