I used a sponge and an all-purpose cleaner. Sponge on, let a minute, wipe a bit, then wipe again with water for a rinse. Don't use Simple Green or any product with a strong odor - you'll regret it later. Remember to stroke the nap in one direction at the end (aesthetics count). 

I used a product only available from janitorial supply houses. It's called GP Forward, and is made by Diversey (used to be Johnson Wax. Very effective, pleasant smell, no allergic reaction - you can also use it around the house. Probably less than $20 for a quart of concentrate. 

Karl Wolz
Sent from my electronic umbilicus

> On Jun 7, 2015, at 4:01 PM, Jeff Palmer <jpalmer@MYMTS.NET> wrote:
> 
> Can someone remind me the best way to clean the underside of the fibreglass top? It got a bit moist and water has discoloured it. 
> 
> Thanks
> Jeff
> 
> Sent from my iPhone