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Awesome. Cheers for that. I'll look into it.
I think the pressure hose has a brush attachment that's I have a feeling is less harsh so I should probably look into that.
I was planning on using No Nonsense clear decking oil as its cheap and seems to be well reviewed.
The roof is a faded green so, the current thinking is using some charcoal coloured roofing paint. It's sort of rubberised, so should both look right and help weatherproof it. The roof is made up of planks so can't really put roofing felt on easily without getting into a load of mods.
Edit: just watched a Charlie DIY and based on price given what it's going on and what I paid I'm going to go with the No Nonsense.
Bought a couple of kg of oxygenated bleach off ebay rather than specific product.
Seems nuts that with cleaning, treating and buying a base I've spent almost double the cost of the house. But then I guess you do this stuff so it'll last.
Pressure hoses are too harsh for timber -erode the lignin or something - I know this from researching deck cleaning technique. Might be fine for something like this tho maybe - what I do recommend is ‘oxygen bleach’ which is powder you disolve - it foams up on wood and lifts all the gross green gunge. I also used osmo teak oil clear on my larch deck - joy to use and has revived it lovely.