Meant to include a comment in earlier post about the 2-part teak cleaners, which I would NOT recommend using! Although they do a pretty good job of cleaning very dark and oxidized oiled teak with a very caustic alkali solution that's followed by a neutralizing acid, they are very harsh and will destroy the soft part of the grain. My experience is that the hard part of the grain will remain, so you'll end up with a very uneven surface that you'll either have to run thru a planer or sand very heavily with something like 60 grit to get smooth again. Unless the wood is very dirty and in very bad shape, your best bet is just to sand it with 60 grit. (Teak is so oily and tough that I seem to get better results with coarser grits and saw blades than you would normally use on something like mahogany.)
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