Deck & pergula need to be patched, stripped & stained. How to strip stain off a deck with Behr Wood Stain & Finish Stripper and Behr Premium All in One Wood Cleaner. Didn't powerwash as it can splinter the wood and leave it less smooth.
Homemade Deck Cleaner Recipes to Keep Your Space Sparkling
Homemade Deck Cleaner "Baking soda is one of the best materials you can use, as far as deck cleaning is concerned. Spread some baking soda on the deck surface and spray white vinegar over it. Scrub with a brush, before rinsing off with water.
In reading up about restaining the deck, I think we should use a deck stripper, power washer and possibly cleaner, and then pole sander or hand sander and THEN reapply. Hopefully well do a better job this year and not have to do again next year.
Painting vs. Staining Wood Decks: Find Out the Pros and Cons of Each!