Need advice (Not a deck, but a wood arbor)

So we purchased this arbor about 3 years ago at Costco. Its real wood and was already stained when we bought it. It looks worse in person thann what the pictures show.

Since I know absolutely nothing about staining or sealing I thought I'd ask for help.

I want to surprise the hubby with a diy project. I want to make this look good again. And I want to do it hopefully, without having to hire someone.

All I know is I have to clean it such as powerwash (use a wood cleaner). Let it dry a day or two. And thats about it. 😂

Now I live in San Antonio, the weather is hot and humid.

Whats next?