That ones easy. Just looks like stone. Hit it with 3-4% mix, let dwell about 5-10 min, may need to hit the bad spots 2-3 times, rinse with medium pressure
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Jesus I wish I knew about this place 2 years ago. Dropping knowledge bombs here!
Water, lots of water. Sodium Hypochlorite just degrades to salt. Just keep surrounding plants flooded and or cover particularly delicate plants. It works just fine.
Awesome. Easy enough.
On the note that sh degrading to salt. I tried finding some scientific/official material stating that it does degrade to salt. I couldn’t find it. I’ve heard it around pressure washing community since I’ve started doing it. I can’t definitely feel/taste it on my skin when it dries. That might sound strange, taste but I’m sure we have all been in some particular situation where it’s unavoidable. I believe it’s not as harmful but I’m not sure it’s 
salt like I thought.
