Adam
Check around and see if you can find some INDUSTRIAL STRIP-X. Has to be INDUSTRIAL.
Comes in 5 gallons only.
This is a concentrate. Mix 3 batches in small amounts. 1 to 1 - 1 to 2 - 1 to 3. Try each one and see which of the 3 will pull the stain off best. If this is a solid base stain, one of these will pull it off. Be sure to neturalize after with oxcalic. Rinse well afterwards. Have any questions, e-mail me.
Jim Bilyeu
Exterior Woodcare