As @Racer said cleaning those fences and patios would be a piece of cake, staining on top of concrete depending on what you use is another story and shadowbox is yet another layer of grief. I am only telling you this so you know what you are in for so charge accordingly. If you use an oil based stain (it’s my go to is Wood Defender stains), know that it will drip for more than a little while and that is a significant challenge on top of concrete. It you use water based it is a PITA to get everything covered on shadowbox or a board on board fence but properly applied you will have very little to contend with getting it on concrete (my go to for water based is Sherwin Williams Super Deck). I stained over 115 fences last year so I have done a few of them. If you use oil based it will weep through knot holes and wick up around the edges and even more at the bottom. It’s really good for the fence BUT the neighbors may not be happy so particularly when doing shadowbox you need to talk to the neighbors because there are lots of edges etc. It can often get you another job because you are demonstrating the care you are taking with the everyone that can be affected by your work.
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