View Full Version : Siding spots

01-26-2007, 09:17 PM
I noticed today that I have black spots on the siding of my addition. Is it possible that it is mold? If, so, does anyone know what to do? What would I use to scrub them off, and keep it away? Thank you.

01-27-2007, 03:24 AM

Does it look like this? This pic is enlarged. This is shotgun mold.

01-27-2007, 05:43 AM
And most likely not on the sunny side of the house.

Wash with a mix intended to remove mildew. Buy it at a big box, or make your own.

I use this mix, starting with an empty 1 gal jug:
1 qt laundry leach
1 cup laundry detergent (liquid mixes easiest)
1 cup general purpose cleaner (Simple green, Mr Clean, Spic-'N-Span,...whatever but *** NO AMMONIA***)
warm water to fill the gallon

I spray on with an ordinary garden sprayer (pump up), and highly recommend using liquids for items 2 & 3 if you intend to do the same, as the powders don't disolve as easily and can clog the screen. Brush as needed before rinsing.

01-27-2007, 07:18 AM
Cass, if that picture is greatly enlarged, then, yep, it does.

The deck gets a full sun, but, this side of the addition it is sheltered.

I will try that mixture, once, the weather breaks. Thank you.

01-29-2007, 06:26 AM
Possibly bug do...? Sap? Are there cafes in the area where grease in the air might cause these deposits? (If it grows then it's a mold) Be careful using bleach...it might lighten the color of the siding....