Tannin Remover is a ready-to-use product for removing stains and spots on wood caused by a reaction to acid and water. It can be used on untreated, oiled and waxed surfaces.
Black/tannin stains e.g. rings/stains from cans, flower pots, etc. 
Can also be used:
- after water damage...
- in case of efflorescence on exterior wood (on the bottom of gates,
    doors, on walls).
Can be used on untreated, oiled and waxed surfaces.
Also suitable for outdoor applications