About 5 years ago, I installed a set of outdoor steps leading up to a
gazebo. These steps are made out of 6 X 6 pressure treated timbers.

The steps are planted into the ground, and staked with rebar. They are
holding up well. They have never had a sealer,
stain, or paint on them.

Within the last year, the steps got a slime green color (not the original
PT color), which I assume is some type of algae growth. This made them very
slippery when wet, so they are a danger to walk on when it rains.

I cleaned them with a 50-50 water/clorox solution, which removed the green
algae. But, I now see quite a bit of black areas, which I assume is
mildew.

Two Questions:

1. do you think that undiluted clorox would remove the black areas of these
steps ?

2. once I get the black mildew areas clean, what should I paint the steps
with ? I assume a sealer will not do well on PT lumber, and I don't think a
stain will penetrate PT lumber very well.

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Am I on the right track ?

Comments and advice please !!

Thanks !

James