Thanks, Julie. The area is about 3 feet by 15 feet. I'll try the baking soda, if the Borax doesn't work. I can buy it in 5 pound bags from the pool supply store. David and Claire Rose in Clearwater, FL On 8/18/2016 12:16 PM, Julie J. via NAGDU wrote: > My first thought was baking soda. Maybe dampen it a bit, let it sit > and then thoroughly hos