Same problem as you existed with the "grass" wallpaper on my 1980 H36C. It looks grass but is actually vinyl.
On a whim when redoing my interior, I wiped the wallpaper surface with Zep Industrial Purple Cleaner and Degreaser, available at Home Depot. I put it on 75% strength, diluted with only 25% water. It disolved all of the yellow and teak oil on the surface. The process only took an hour or so for the two wallpaper bulkheads on my boat. Be sure to wipe several times with clean H2O to remove all of the detergent. The wall paper now looks a virtually new creamy off-white/tan. The Industrial Purple did not damage the surface. And the wallpaper on my boat was still firmly bonded to the bulkheads. So the outcome was great.
WARNINGS: This Industrial Purple mixture is really strong and will cause detergent burns on skin. Wear water proof gloves. Protective eyeglasses are a must. Try not let splatter on clothes. Immediately wash off any detergent that gets on skin. Do not wait. Do not allow the mixture to splash/run were you don't want it such as on the cabin floor or nearby teak as it will damage the finish almost immediately.
Experiment on a small inconspicuous section. The Industrial Purple will remove teak oil from the teak wood bulkheads and fittings, leaving the wood devoid of teak oil. (Actually I used it for this purpose on my interior teak. Then washed several times with water. Then lightly sanded and recoated with an oil-based rub on oil. The interior teak now looks great. The wood grain shows wonderfully in a rich cherry red color.
