Use Winsor & Newton painting cleaner to clean varnished paintings. This cleaning product specifically for paintings is excellent for removing dirt and oxidation products from linseed oil and varnish. Unvarnished paintings can also be treated very carefully with this painting cleaner. Stop treatment as soon as the paint starts to come off. To remove a complete old layer of varnish, go to a restorer. This bottle contains 75ml of painting cleaner and must be shaken well before use.