Help me clean this deck please

So I have a family member interested in cleaning and resealing his deck. I’ve done it once before about a year ago and it came out pretty good but looked like it did pre cleaning about 6 months later. I used a cheap water based stain from home depot. He just hired some one to reclaim it yesterday (I’ve been too busy and decks sent really my thing) and as far as I can tell it looks the same. I haven’t gotten the details yet but it looks like they just used water and pressure. I would like to strip, clean, and reseal with a quality sealer. I understand the basic steps. But I would like to know how an experienced professional would go about this. I’m going to basically do it for free, I see it as a great opportunity to expand my horizons.

This is the deck AFTER the most recent cleaning.

I have a great success with a chemical called woodrich. They make a great cleaner with a mild stripper in it called EFC38 and a citralic brightener for a ph balancer… looks like a perfect match for that deck

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Thanks for the help. I guess the guy that did it is going to come back and sand it before re stainingso that’s why he didn’t really cleanit well.

It seems odd he’d leave so much to be sanded. I just did mine with nothing but water and pressure and it came out way cleaner. I have a little sanding to do but not a ton. Have a couple of boards to replace - one is starting to rot and 1 the dogs decided to chew on. Mine has been untouched since a VERY light wash and coat of Cabots in May 2015. Before that it was a very heavy/thorough wash and coat of Cabots in May 2012.

My best advice (and I’ve done a lot of decks) is don’t use water based. I know they say there’s been lots of improvements in recent years, but I used Behr up until they took the oil out of their semi transparent stains many years ago, then went to Cabot.

I just don’t see how anything water based can ever be as effective repelling water as something oil based.

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I guess the guy is a painter by trade so he probably doesn’t really know the ins and outs of pressure washing.