When done properly, graffiti can be removed from wood. One must be very careful, as always, to not use too much water pressure. We apply the right chemical agent to break up the paint, then wash it off very gently. Multiple applications are usually required to obtain the desired result. There is frequently a very faint shadow that remains which is barely noticeable. We leave no damage to the wood. This faint shadow will gradually, over time weather away and disappear. If you have any questions on this or any other type of cleaning please contact us right now.