3 yr old Metal building with mold

[Tronman 14]

I have to clean a white metal building with small mold spots. Can I use a truck wash, Windex, or store bought 6% Clorox through an x-jet? It is 2900 sq ft of siding 12 feet tall. Worst-case scenario is that I have to scrub up 12 feet. Best-case scenario is I can touch-free spray wash the gray mold spots off.

[CLASSICPW 14]

It's probably an aluminum or sheet metal bulding, go with the bleach and a detergent. Find a pool supply place in your area and buy a 5 gal liquid pool chlorine jug. It's 12.5% bleach. I used to use Dawn, but I buy a 1 gal jug of Blue Coral car wash with wax @ Walmart for $4 now, it works great with windows.

[Tronman 14]

WHat proportions of chlorine to water.1:5? Then 1/2 pint of Blue coral?

Do you X-Jet that 12% on to get a lower concentration, or do you use a shureflo or pump sprayer to get 12% on the siding?

[Barry M 73]

I believe if it's sheet metal you'll have to treat it like a gutter and use a butyl degreaser. My .02 cents.

[Tronman 14]

I purchased some Fleetwash notouch truck wash from Ramteq. I will add a couple of quarts of bleach to that in a 5 gal bucket. I bought a rotating brush on an 8 foot wand with a trigger handle.

If anyone has any better ideas - please let me know. I start on it at 8am.

Thanks