Tent zipper stuck? Don't force it—check fabric and trapped grit
If a tent zipper jams, check for caught fabric and brush sand or grit from its teeth. REI warns against forcing it and recommends an appropriate zipper cleaning/lubrication product when needed.
Sand, mud, dust and salt can make a tent zipper difficult to move. REI recommends brushing the teeth with a toothbrush and rinsing stubborn grit with water before brushing again. For waterproof zippers or coated fabrics, prioritize the tent maker's own instructions.