Graffiti on Wooden
with Bare Brick
Wood is made of cellulose fibers and there are solvents and pigments in spray paints which can penetrate and stain wood like ink to blotting paper. Also, there are some timber fences such as western red cedar which may turn dark in the presence of alkaline cleaners, and while this darkening can normally be cleaned its important to know before embarking on full scale cleaning. Always test first and make sure you can clean a small area perfectly before coating up the entire fence.
Depending on the type of graffiti and wooden substrate Transgel may be the best remover, as it is PH neutral and totally nonreactive to any oils in the timber. It can also soak up inks and stains with a long enough dwell time.
Typically you will need to pressure wash the fence which can be intrinsically troublesome due to the softness and natural ageing of timber as well as the presence of growth and algae. If you're not careful with your gunning technique, you can easily leave distinct clean patches where you have been, and for this reason need to finish whole sections to even out the final appearance.
Gunning/rinsing too close with a pressure washer can result in a stringy fence, which might create a bigger job of sanding it down later, so be careful not to come in too close with your wand. Use a flat angled spray tip; never zero degrees or a turbo blaster. See before/after examples below which are typical removal jobs on a wooden fence.