The yellow stains are most likely algae. Superchlorinate and lots of brushing until it is gone. Then brush again. You may want to clean the filter too.
Use a steal wire brush to brush off the yellow stains. Also, it might help to keep the chlorine level high.
Stain Magnet from GLB.
Depends what caused the stains.
Because its yellow
Yellow stains are tough to remove. Recommendation: good, old- fashioned bleach.
It's to remove yellow surface discoloration or stains (e.g.,tobacco stains)
First you stop smoking…
bleach Or if that cant be used nappy sann
You may have to sand them out and re-varnish.
just dont be messy and you wont have to know.
Bleach might do it. Also investigate the cause of the stains by observing pool users.
i stored a vinyl hot tub in storage and now it has yellow and black mold stains on it. how do i remove the stains and smell?