We recommend cleaning the slats of the Roldeck at least twice a year with a high-pressure hose and a hard brush. Algae may develop both on the top and on the underside of the Roldeck. This can be resolved by diluting the chlorine with 50% water and pouring the solution over the slats using a watering can. Limescale could also develop on the top of the slats. In that case, first moisten the slats by spraying a descaler across the entire cover using a spray gun. Allow this to penetrate for 1 or 2 hours. You can then rinse the Roldeck off in rows from left to right. In this way, you wash off all the limescale from the grooves.