Staining all wood that is visible is the rule of thumb.

TSP will not work. Use this:

No, you can't do that. Look at Armstrong Clark in Driftwood Gray color. It is oil-based:

Never use paint on a deck. Best is a penetrating stain for ease of reapplication. Wait 48 hours after prep or rain to apply TWP stains. The caulk will...

Apply right away while the wood is damp after cleaning and rinse off grime.

@gas7773 Order online. They are better and offer samples.

@gas7773 Messmers is okay but others rate better.

@gas7773 1. Two weeks. 2. You can use TWP 1500 Series for CO and it is oil based.

@ouduckpond77 Behr is a filming stain that applies more like a solid stain than a semi-transparent one. It will need to come off and that will require...

Yes, strip and brighten all wood while using a pressure washer. See here for tips on stain strippers: Once fully removed, use a proper penetratin...

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-See this about hardwood decks and stains to use: -No need to stain the framing. Leave as is. -No need to tape the joists. -We have no experi...

Looks like mold. Wait until spring, prep, and stain. It will come off.

You will be fine.

@keebo Sorry, but I have no idea how to fix this. Never seen this happen.