All right gents. I just got a voicemail to wash this house. Looks like Wood siding to me, I’ve only done vinyl so far. What’s different about cleaning wood siding?
Might want to do a search, there are a few good threads on the subject. You also need to determine what type of wood it is and what sealer/stain is on there.
Yeah I have but am coming across a lot of info and conflicting info. I’ve seen house wash mix, taking off sealer, stain, paint, people saying they had to use pressure. I’ve seen a lot but none of the answers made me feel great about them so far.
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Is it painted, stained, or sealed? Oil based or waterborne? Does it have a lot of organic stains or just dirt and cobwebs? There’s no one way to attack wood it depends on what exactly you’re dealing with.
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This is something I’m slowly learning. I think we all want the one fix, that’s it, easy button and so far I have yet to find it. If anyone else can locate it let me know I’ll take two.
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Its 2020. The aliens took it. 
This is just my experience, regular HW mix has cleaned all of the wood homes that I have washed regardless of finish or type of wood…if something is dirtier than that will handle, I just pass on it. I don’t have a 12v system, don’t really like Xjet…so, it is HW mix or nothing. I will say, HW mix really does a good job on them with a little dwell time…just have to realize it is not gonna take a lot of heavy mold and mildew off.
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Your challenge with doing this or any wood is that if there are spots where the stain etc has failed you run the risk of “brightening” those spots and once the organic and dirt is washed away it will be very noticeable. You need to ensure your customer understands that upfront or they will think you did it with pressure and expect you to fix it.
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