I use Windex outdoor window cleaner to wash my windows on the outside. You know the kind that attaches to the hose and automatically mixes the cleaning liquid in the bottle with the water from the hose. When it is empty I save the dispenser and use it to clean my cedar siding. I fill the empty dispenser with straight Clorox Plus. The mixture that comes out is just strong enough to kill mildew and clean my siding. It actually reaches the second story so no ladder needed. I wait for about 1/2 hour then use the rinse setting which dispenses pure water. It works great.
Share Your Feedback: Once you try any of the above solutions, be sure to come back and give a "thumbs up" to the solution that worked the best for you. Do you have a better solution? Click "Share a Solution" above!
Here are questions related to Cleaning Wood Siding.
My "silk flowers" used in outdoor planter baskets are leaking red dye down my wall. How do I remove the dye from the silk flowers off of the baskets and wooden walls on the outdoor surface of my house?
I certainly haven't had any experience with this, so if I were you, I would start off with just some Dawn in water, and see if that takes it off. It may not be that difficult since it just dissolved in water. If that doesn't work, I would try bleach, which is great for taking colors out of clothes! Good luck!