I have redwood dog ear fence that has been up for a year,

I would like to use a sealer on it. Very unsure what to go with. I would like a clear finish because I like the natural color of the redwood, but I heard it does not stop the wood from turning black because of no pigment in it?

Another idea would be to leave the wood unfinished and use a cleaner or brightener every year?

I have done the research and I think I will go with TWP100? I searched for TWP but I seen alot of reference to TWP116, not sure, I came across this site TWP100.com??

The fence post and horizontal are treated 4x4 and 2x4, and they have a dark cocca stain color to it. I also want to make sure the sealer or cleaning agent won't discolor this finish and stain the redwood.

I also need a cleaner recommendation that might possibly remove the nail streaks that occured. Would oxalic acid do the trick?

Thanks in advance