Have you considered using a mixture of white vinegar and baking soda? I've heard it can be pretty effective for mold removal. You could try filling the tank with this solution, letting it sit for a while, then scrubbing it out thoroughly. Just make sure to rinse it out thoroughly afterward. Also, if you're still on the lookout for solutions, I came across some information about water damage restoration services that include mold removal. You might want to check out www.alldryus.com for more details. They could provide some valuable insights tailored to your specific situation.
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