driveway/cement cleaner

10% bleach. Should be available at pinch a penny.

just more pressure for the cement , jo max mixed according to label for siding etc

That's the set up I use.

Liquid chlorine, like you get for your pool or hot tub.

Yep.
Spray a section,then pressure wash .
When finished i spray again.
Not sure if that is overkill or if spraying before or after is best.
It works so I just stick with doing twice.


And throw down some water on the grass before spraying to protect from chemical burn

Our concrete driveway is in a heavily wooded lot. At least for us, pressure washing doesn't last or do as good a job compared to spraying Wet-N-Forget once a year. I spray Wet-N-Forget everywhere mildew, mold, algae, moss is a problem. It keeps the house, driveway, our deck, courtyard, lawn furniture, etc. looking new. It's expensive, but easy. I use a battery operated 2 gallon Scotts Professional sprayer to make it easy to apply. I'm not saying this is superior to pressure washing, but it's a good alternative that works well for us in a very shaded lot.