Removing stains

I have a one year old liner that has some brown staining from bad algae before I cleared it up using the BBB method. The pool is perfect otherwise. I have tried brushing it by diving down with a scrub brush but can't stay down long enough to get a good scrub!

Also, I have a dark gray " ring around the tub" on the stairs and the bottom of the plastic edging that holds the liner.

Any ideas?

Thanks!
 
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