My white sufaces, mostly steps, started to yellow. I tried a product called StainFree (Ascorbic Acid (vitamin C on steroids I think)
Am worried that the StainFRee is using up chlorine.
Directions were worthless. Said to lower chlorine to 1ppm before adding, wait 24 hrs then vac and BW. Then keep FC at no more than 2 for a week. I raised to 3. In 12 hrs it was back to .5.
Hope this stops soon. Anyone have any expeience with this stuff?
FYI, it does seem to be removing the yellow stains