Many problems come with power washing. Many people go for Concrete Pressure Washing/Power Washing due to the fact that is cheap. You do not need high tech equipment or chemicals for the process. The water leaves the nozzle at a very high pressure and at a very high speed. This high pressure will not only gets rid of the dirt, but also particles from the wall that eventually wears it out.
The other problem is that walls are porous. This means that water will get into the tiny spaces between the concrete wetting the wall both on the outside and the inside. While it might not cause any harm when done for the first time, continued cleaning will eventually make the wall too wet hence too weak and it might even collapse.
The noise that is emitted by these machines is simply too much. The work causes such a nuisance to a point that it is impossible to concentrate on anything. This disturbance can be heard in the entire neighborhood which is a great inconvenience. In the event that it is in a busy town area, then it is worse as those operating their businesses have to bear with it till the cleaning is complete.
Using the machines requires that you be very careful. This is because there are many accidents that can occur while using it. You will be required to dress properly to avoid burns by the chemicals on your skin or even eyes. The nozzle should also not be too close to the surface to avoid getting overpowered. This therefore requires that whoever is handling this equipment be highly skilled and strong.
There are many types of machines that are meant for this task. There are those that are gas powered and those that are electric powered. They are all equally good; therefore you go for the power source that suits you. You need to learn how to use it first, if need be, practice in a closed area first.
The nozzle needs to be pointed away from you, any other person or anything that can get damaged. This is to avoid any accidents that would be fatal. If possible, one person should handle the equipment while the others keep a safe distance.
There are settings that should be set before use. Each machine comes with a user manual that will help you. In the event that you have any queries, then you should consult an expert about it.