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Quick answer, Throw it over the mattress and leave. Ha Ha! Not what I guess you meant? If it is the wood frame or headboard. Rub it down to reveal unvarnished wood. Add steel wool into vinegar overnight, until it disintegrates leaving a brown liquid. Strain the liquid and that's your stain. Hope that's what you were after!
Totally agree with soaking the steel wool in vinegar. I let it soak for a few days and it looked disgusting but when I stained old wood doors with it they looked amazing. Just like expensive reclaimed wood. Good luck