Removing blackened wood water stains

[Findm-Keepm]

"Zud" cleanser also has ~10% Oxalic Acid in it - we used it to clean those black stains left when felt pads or foam pads deteriorated on lidded entertainment units - yes, blonde sets looked particularly bad with the stains. A Popular Mechanics article had details about removing stains from furniture, and that was the genesis of our use.

On a side note, it (Oxalic Acid) also cleans pitted chrome nicely. My '74 Civic bumper was in sad condition - 20 minutes with some Zud cleaned all the rusty pits back to a shine, and made the car look better (as good as a pregnant roller skate can look....)