Attached is the interior of my bathtub. The darker parts appear to be more like stains rather than dirt that can simply be washed off. What causes this and what do I need to do to clean it?
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Just a couple cleaning sprays, like an all-purpose and a tub cleaner with a sponge. I was apprehensive to scrub really hard or use something stronger, so I thought I'd check here to see if that's all I need to do or if there's a different method I ought to use.What have you used to attempt cleaning it?