Things You'll Need:
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Step 1
This project is fairly simple in principle. To remove the moss, you simply need to use a power washer. That's the simple part. The next steps requires some careful consideration.
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Step 2
Do Not Use chemicals such as bleach or laundry soap. They are toxic and may harm the environment including your own lawn/garden vegetation. In many cities, the residue run off from these chemicals is illegal as it pollutes the storm drains and allows harmful chemicals to enter the water supply at various points. Using chemicals also opens an opportunity for physical harm to humans and animals.
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Step 3
Using a pressure washer will remove the moss with the least amount of physical effort and with the most safety for you and the environment. Before selecting a pressure washer, consider the amount of work to be done (how much moss and its age), and the age of the concrete. If you have lots of moss on old concrete you will want to balance the need to get the job done with the fact, too much pressure could blast away some of the concrete.
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Step 4
Hot Pressure WasherHere's a picture of a small heated pressure washer. It's portable and a good example of one you could rent. The advantage of hot water is the ability to deaden and loosen the moss as it washes for easier removal. The steam could also kill moss bacteria further delaying the return of the moss. This machine requires care when using however because it could cause serious burns if not used carefully.
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Step 5
Cold Pressure WasherHere's a picture of a small cold water washer. It offers the similar benefit of portability as the hot washer, without the risk of burns. The cold water washer depends completely on pressure to do the job, so it may take longer.
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Step 6
Protecting your concrete. If your concrete is in good to new condition, you may consider applying a product like Thompson's Waterproofing for concrete. Refer to the manufacture for specifics.
