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For common black scuff marks, you can choose a commercially available acrylic cleaner or a neutral, non-abrasive all-purpose cleaner: Steps: · Clean the stained area with a damp, soft cloth; · Spray the cleaner onto the black mark; · Gently rub with a microfiber cloth or sponge in a circular motion; · Rinse with warm water and wipe dry.

Acrylic spa bathtubs: A thick layer of acrylic (usually 2-5mm thick) is visible, with a fiberglass reinforcement layer underneath. Fiberglass bathtubs: The overall surface is thinner, with no visible acrylic panels. The interior is often a one-piece glass fiber composite material.

When the water in the acrylic spa bathtub is heated to about 40°C, the acrylic surface quickly absorbs heat and expands outward. Since the supporting layer (such as fiberglass) or metal frame below it expands less, the slight displacement between the two materials will produce friction and stress release, thus forming a squeaking sound.