Leaderboard

Agree with Beth. That is going to be a very difficult strip. The Cabot's looks virtually new on the rear wall and little weathered on the front of the garage. We use ACR's sodium hydroxide stripper, which is similar to HD-80. I'd test first with a mix of 12 oz./gal. of stripper, 8 oz./gal. of 633ADD or similar, and a bit of surfactant, say 3 oz./gal. ACR sells Booster surfactant in gal. jugs. As you are dealing with vertical/overhead surfaces, the surfactant will add a bit of "cling" to your mix and also keep the mix wet a bit longer. You must keep the mix wet on the wood! Work on reasonable sized sections, adding mix as needed. Beth's suggestion of a stiff brush is probably going to be mandatory. Break the bond and apply more mix! Then keep wet with mist from your PW. Do a "scratch" test, it will tell you if the stain is ready to be washed off. It may take a while to dwell before it is ready to be removed. The wood is going to fir. Plan on a light sanding.