NAF Thelwell Ultra Violet Shampoo 300ml. When you have spent time cleaning and can still see dirt, stains and grease, invest in Thelwell Ultra Violet shampoo. Formulated to provide a deep cleansing wash to bring out their natural tones from head to toe. The toughest of direct, stains and grease can be tackled and this well help you stand out from the crowd and save time on cleaning.