Why you should wash your house!
Updated: Mar 6, 2020
What are the Dirt Colors on My House?How do you know if your house is dirty?Can it be cleaned if it has some weird color on its surface? What dirt color is affecting your home? Sage to Lime Green: Lichen. Typically found on the roof’s northern often shaded side. Lichen must be removed as it grows roots that can shorten the life of your roof. Green, Hunter Green: Algae. This is seen mostly on untreated decks and home’s northerly shady sides. Black (on roof): Mold. Characteristic of black soot like streaks on roofs. Since roofs are made presently with some limestone instead of just asphalt like decades past. The organic limestone feeds algae causing the mold streaks particularly on the north side. Therefore, pretty much all roofs will get at least black streaks of mold in time.
The dirtier the house, the easier it is to clean! Dark Grey or Black: Mildew/Mold. This can be seen throughout a home’s exterior that has not been cleaned in some time. Black Dots: Artillery fungus spores. This is typically caused by spores growing in dark mulch and is attracted to light colored siding. The spores then launch their ‘artillery’ at the siding. While it is near impossible to clean, you can stop the spores by getting rid of the hardwood mulch and perhaps going with stone or another type of mulch where spores will not grow. Brownish Grey (with shades of Green): Algae/mildew mixed. Dirt and dust typically under a porch or eave. Construction dirt. Orange, Rusty Orange: Iron. This could be from a tint of orange to a deep vermilion. Any and all of it is characteristic of iron. Medium Brown: Mud Dauber Insect or other insect nest. Some of these insects make nest on the siding others under the siding. A professional power washer should go back to make sure no insect nest is leeching from under the siding which can cause permanent brown stains that difficult to remove when dried. Dark Brown: Bird’s nest mud. We will happily clean off these nest as long as mother chicks have flown the coop. Pale Yellow: Pollen. From March-June every home here gets hit with Pollen, but is easily removed with House Washing.
White to off White (powder): Oxidation. Oxidation is a ‘pre existing condition’ typically on the south or sunny side(s) of a home. It is NOT dirt but a break down on the molecular level of the siding itself. An inexperienced power washer will leave streaks on your siding if it has oxidation present. To test for oxidation, rub your fingers on the siding of the south side of the house. If a white chalk-like powder comes off on your fingers, you have oxidation! The good news, all of these dirt colors can be removed with House Washing …Believe it or not, The dirtier the house, the easier it is to clean. The cleaner side of the house is actually the bigger challenge because of the chance of oxidation.
Everything above can be cleaned except Artillery Fungus Spores. Oxidation has to be dealt with as an individual case and is worse with some siding colors such as tan or blue.