Millboard’s Lastane coating is made of a non-porous material that resists stains and algae. So your terrace, balcony or garden path will never get slippery! Thanks to this UV- and weather-resistant top layer, you hardly need to maintain Millboard boards. Should there still be some dirt on the boards, it can be easily removed with a broom and a little water. Never use a pressure washer or any type of chemical cleaner, abrasive, thinner, wax or oil. If you do, the boards may be damaged and the warranty will be void.