To prepare the surface of rough cut cedar siding wash the siding down with a good wood cleaner and follow that up with an application of wood brightener. Never use house hold bleach on raw. Yes max is 30 min with the oxalic acid but you do not want it to dry out and you can skip the oxygen type bleach if you have a good power washer it just strips off the graying and dirt from raw old wood i use a 3500 psi and it works really sweet then the oxalic acid will restore the wood to a new wood look.
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