Rust stain

Crush up some cheap vitamin C tablets, place them in a sock and hold the sock (weight it down) against the stain for about 10 minutes. Longer may be necessary. It may not get it all but it will get a lot of it.
 
Pretty good chance it is not rust but also an equally good chance they are permanent.

I removed a construction nail (probably been there all winter) from the bottom of my vinyl pool and cannot remove the stain with vitamin C. I pretend it's not there. :shock:

You could probably have some affect on it by concentrating some muriatic acid on it but you stand some chance of damage to the liner.....not worth it in my case.
 
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