we are buying a beautiful riverside 2200 sq ft ranch house built in 1991. the builders put t-111 siding up but i don't think anything was put on to preserve it. most is in good condition with some small areas that need replaced. how is the best way to go about this? pressure wash and apply what type of preserver? we don't want to paint as we like the wood look. also do we make the small repairs and then pressure wash and let sit to get some of the "weathered" colorization back into the wood?