HANDLING & STORAGE: Stack short sheers on fop of Longer storefront sheets In a cool and dry place out of direct sunlight. Prevention solar heat buildup, avoid catering the stack of sheets with a dark tarp or other heat absorbing material. THIS SIDE UP: The UV-protected side of the sheet has a product label indicating the exterior side of sheets that must face towards the sun. CLEANING: Normal dirt and dust accumulation is washed off by periodical naifs.