I live in Metro Detroit. The deck is about 7 years old. I stained it last summer using Thompson’s Waterseal and it is already peeling (it was power-washed, then cleaned with Valspar deck cleaner before being stained). I decided to re-do it again this summer. I power-washed it and then cleaned it with a deck cleaner. I am considering an oil-based stain this time (Cabot). I am wondering if I should do anything before I stain it.

I am attaching some pictures (after it has been power-washed and cleaned with a deck cleaner)