I have never had that problem except in one place where a shrub was so dense that sun could not get through, I took it out. If I were you I would call a paint company that sells paint. I found out they have a paint that has insecticide in it, which I will use when I repaint. They may one that resists mold and mildew.

I use a bleach solution like your husband plans to do. You could cover the plants with a long plastic drop cloth. It will help pull the plants away from the wall. You leave it on just long enough to wash and rinse.

I haven't used this stuff, but it looks interesting - spray and forget
I can't get the clickable link to work:
www.sprayandforget.com

Krud Kutter Mold and Mildew Stain Remover contains no bleach. If you allow it to work, it works. Found in the paint section at Wally World. Can manually spray with bottles or do the hose hook up option.

I use dishwasher tabs hot water and small angled from home goods broom. Use on your windows also when you rinse the water runs off in sheets!

Red

Hi,

I'm wondering what you ended up doing, as I'm researching the same thing. I found this So Safe product:

http://store.sosafeusa.com/mold-removers/1.32Gal%20(5Lt)%20SoSafe%20External%20Surface%20Revival

Wondering if anyone has used it?

Thanks!

Here is a link that might be useful: So safe bleach alternative