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  • Removing Black Stains in Wood Furniture With Oxalic Acid

    Wish I had seen the lemon juice idea first. A lot of powdery residue got stuck in the oak grain of the table leaves I was working on (not the main table top for some reason). Maybe it was because the grain on the leaves was more open due to stripping off the varnish right before applying the Bartender's Friend. I plan to continue trying mineral spirits or water and a stiff brush to dissolve or brush it out. It is not coming out easily. If I can't get it all out, will it cause a problem with staining and varnishing?

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