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Starting with 80 will be just fine. A few quick passes to take the top layer off. You could start with 100 if you are iffy, it will just take a little longer to strip. The dark lines in the grain are harder than the lighter lines. Redwood is very similar to cedar in it's softness. A random orbit sander is the way to go with a detail or a multi-tool in corners using the same sanding pattern. My guess is finish up around 220. Starting with 180-220 will first clog very quickly, but most likely will burnish the wood rather than sand it due to the oils on the surface. You need to remove the top 1/32" before you can start to restore the surface.
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