Cleaning and polishing the HOT TUB acrylic surface
Each time you drain your spa, before you refill it you should
clean your spa shell with an all-purpose cleaner and apply a coat
of surface protectant. Use a low detergent, non-abrasive cleaner
specifically formulated to clean the spa without damaging its
acrylic finish.
Use a non-oil based
surface protectant that is specifically formulated to protect the
spa's finish from the chemicals and minerals associated with
normal spa use.