To maintain a low upkeep deck, choose materials known for their durability and low maintenance requirements, such as composite decking or PVC. Regularly clean the deck using mild soap and water or specialized deck cleaners to remove debris, mold, and stains. Avoid using harsh chemicals or pressure washers that could damage the surface. Inspect the deck periodically for any signs of wear, damage, or loose boards, and address them promptly. Lastly, consider using protective coatings or sealants recommended for your specific decking material to enhance longevity and prevent moisture damage.