@bobr You can go ahead and stain as you removed most of it.

That is oxidation that you did not fully remove when using the cleaner. Redo the prep and make sure to use a pressure washer while using the cleaner. ...

Post pics.

Yes. We typically use just a white or red pad to buff off fuzzies. If needed, you can also get the sanding discs and use them under the pads.

@elav Not sure but it would not hurt to try. Rent a buffer and sand: Light recoat after if it seems to work.

Restore A Deck in Natural or Armstrong Clark Stains in Natural color.

That would vary based on the stain brand you are choosing. The semi-transparent stains that we use and suggest would fully show the wood grain the sam...

Wood temp can be 20-30% hotter than the air temp. I would suspect this is the reason and you "flash" dried causing the uneven appearance.

Looks like it was applied unevenly or possibly the stain was not mixed evenly prior to and continually while applying the stain. Also could be an issu...

The directions are on the container or the website on how to use.

The white spots are part of your wood knots. Not an issue.

@r4ntoy You have a solid stain so the easiest is to stick with a solid stain. See this for prep tips: SW stains are poor. Look for a better ...

Never used it so not sure of any good. Probably decent but I doubt it is "better" than our top-rated brands.

Hard to say but yes, it might show through some.

The green is internal and will most likely not come out.