Uh huh, like anyone would spend $65/gallon for something that might work.
I may have to refinish my deck with Olympic sealer every year, but I had to do that with the Penofin too, except that I had to remove all of the old, blackened finish first.
It wasn't just spray, brush and rinse -- it was spray, brush, brush, spray, brush, scrub, spray, scrub, scrape, rinse.
It took me a week to refinish a small deck and I got tired of it REAL fast.
I tried the outdoor bleach/soap method for cleaning my deck this year. I get a fair amount of algae from being in the shade most of the day and the bleach/soap method didn't remove the algae. Olympic Deck Cleaner plus more scrubbing got rid of the algae. If it hadn't been for the algae, the bleach & soap would have worked fine -- the deck was clean and bright except for the bright green areas.