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Barkeeper's Friend is, just like it says, an abrasive cleaning product, containing oxalic acid, for commercial stainless steel equipment, sinks, etc. I would never use it on gelcoat of any kind, so do so at your own risk. BW does not recommend it either.

To get teak oil and varnish stains out of non-skid, spray on Amazon's One-Step Teak Cleaner and let it sit for several hours. This is the best of the teak cleaners. It will dissolve the varnish content of the teak oil (which is what you actually have - dried thin layer of varnish) and lift it off.

I also use the teak cleaner for a soak for cleaning up SS fasteners and other fittings with either teak oil or varnish on them.