Clean your spa cover monthly with mild dish soap or hand soap diluted in water. Hose the cover off and dry with a towel.
Use 303 protectant spray or wipes to keep spa cover conditioned. do not use a silicone-based cleaner, like armour all.
Use a spa cover lifter to avoid damage while moving it.
Remove snow accumulation of 12+ inches.
Mildew can be removed with a vinegar solution.
Do not use an abrasive sponge. Instead, use a small, clean hand towel, regular sponge, or soft bristled brush.