Small Rust stains

I have my water perfect but I am getting small rust stains on the bottom by one of the vents. Any ideas on a quick easy way to just clean them. I'm thinking a small amount of some type of cleaner or is it better to add some new chemical like a scale remover. I am currently using brominating tablets and some shock. I'm happy with my water conditions but if adding another chemical is the answer I'm great with that. Thanks in advance. Rico

You can try some soft scrub non abrasive cleaner to remove them. I would try in a very small spot at first.