The answer to 'how to maintain bathtub' is to regularly clean, inspect, and perform basic maintenance on your bathtub to keep it in good condition. This includes scrubbing the tub with a mild abrasive cleaner, checking for cracks or chips, and addressing any issues promptly to prevent further damage.
It's recommended to clean the bathtub at least once a week, using a soft cloth or sponge and a non-abrasive, pH-balanced cleaner. Avoid harsh chemicals or scrubbing pads that can scratch the surface. Inspect the tub for any signs of wear, such as cracks, chips, or loose caulking, and address these issues right away to prevent water leaks or mold growth. If you notice significant damage or the tub is difficult to clean, it may be time to consider professional refinishing or replacement.