I picked up this 4x4 and 2x6 B redwood yesterday and gave it a wash using Oxiclean to get the dirt and mildew, then an oxalic acid wash using 2 cups acid to a gallon of water. The 2x6 came out nice but what happened to the 4x4, it’s all black after the oxalic wash.
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Any remedy for this or do I need to sand it all out?
I'm reading up on it now and came across this rinsing Info which I've never done using oxalic acid before-
'Mix a neutralizing solution of ammonia and warm water, or Borax and warm water, in a plastic bucket and thoroughly rinse the wood surface.'