We recommend cleaning your craft with a mild household cleaner to remove dirt and grit. To protect the surface from UV and avoid color fading and to bring up a nice shine you can apply a 303 protectant 2 or 3 times a year. CAUTION: Do not use petroleum based products or strong solvents as this will cause discoloration and damage to the laminate. Impact on Royalex and Royalite canoes will usually cause a indentation in the laminate. They will usually work themselves out after warming in the sun. Larger dents can be worked out by gently warming the area with a hair dryer or hot air gun. The trick is to keep the hot air source moving to warm the area gradually until the dent comes out. CAUTION: applying heat too quickly will burn the surface, be very careful with heat. THIS TYPE OF DAMAGE IS NOT COVERED BY OUR WARRANTY.