Help with brightening un-stained ("natural") board and batten siding?

I was hoping some of your wood experts could give me some direction on this. It appears to be either pine or hemlock - the customer didn’t know. She’s hoping to get the wood brightened up to a much lighter shade. I don’t even know if that will be possible.

What will be the best process for brightening this siding? Which chems, pressure, etc? And how many man-hours would you plan on spending on this, if it were one guy with a 5.5gpm machine?

Here are some pics of the home. It’s a 2 story house that’s approx. 25’x35’.

@Infinity how did this one turn out for you? I have one coming up that looks close to this.

I passed on the job.

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Good move. That’s a ton of work.