Wow, you're screwed basically. It's next to impossible to remove stain in such a way to make it uniform in appearance. Back to the lumber yard you go having learned an expensive lesson.............test the stain on the back of the wood or on scraps to get the look you're after.
It is oak which is a hardwood so you may have some luck with a rag dipped in mineral spirits that you can wipe up and down each piece of wood, but, man o man, that's gonna be a job.
i would wipe it down with a damp rag of paint thinner ,i think youll be able to kind of wipe or buff it .depending on how large of an area i think it is very doable. when done i like to soke rags is water then throw away
If the stain is already dry, then I would try washing it down using lacquer thinner and 4 ought (0000) steel wool. After you’ve removed most of the stain, make a thin mixture of the same stain you used just to even out the appearance if necessary.
P.S. Before you start get a GOOD pair of chemical resistant gloves and use them.
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