To maintain your painting at its best, Winsor & Newton Acrylic Varnishes can be readily removed when dirty. Simply apply Artists' Acrylic Varnish Remover or Galeria Varnish Remover and gently rub into the varnish film. If slight pigment is visible on the cloth this is an indication that the removal has been successful. Use plenty of clean cloth to ensure varnish is being removed from the surface. Avoid undue abrasion.