Power Washing Green Mold Stains
Last spring I finally got rid of those nasty greenish mold stains, or whatever they are, from the sides and doors of my free standing two car garage. The house and garage were built sometime in the 1920s and the exterior of both is stucco. There are countless coats of paint on them. For some reason after each fall and winter the garage gets this ugly green mold which really stands out on the white stucco. The house itself does not get this stain.
The garage is a detached block construction structure with a pitched roof. The roof is very old and has large areas that are covered with moss. When we replaced the roof on the house several years ago we elected not to spend the extra money on the garage roof, even though it probably needs to be replaced. It’s not leaking at all and, well, no one lives in the garage except for my car and the lawn mower. I suppose it is possible that the mold originates from the moss on the roof but I’m not sure. A neighbor told me that the large elm trees above the garage may be causing the stains. Whatever it is, I hate the way it looks and now every spring I get rid of it by power washing it.
Two years ago I invested in a 3000 psi pressure washer that I bought at Wal-Mart. It was fairly expensive but I checked around and Wal-Mart had the best prices. By all accounts, this machine is a bit overkill for residential use. It is pretty big, much bigger than my lawn mower and takes up a lot of space in the garage. But it works great. A friend advised me to get the more powerful model when I was shopping since it can really cut the time it takes to do a job. It is very powerful and removes the green stains in one pass.
My power washer comes with a standard gun and several different nozzles, depending on the type of stream you want. The optional telescoping pressure washer wand was also a good idea because in many cases it eliminates the need for a ladder. I used it to remove some of that moss from the garage roof, the loose parts anyway. With the extendable wand I was able to safely clear leaves from gutters without a ladder. I even used it to remove a really gross bird dropping from my bedroom window.
Of course the downside of owning such a nice piece of equipment is that just about everyone wants to borrow it to clean fences, siding and patios. As long as they take care of it and return it with a full tank of gas, I suppose its fine.
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