One thing you want to ask your power washing contractor is if he uses a surface cleaning machine. These machines help the contractor cleaned faster and more efficiently. These machines also help eliminate unwanted stripe marks in the concrete that is very common from a traditional wand technique. Also, they help prevent nearby plants and bushes from getting damaged from overspray from a powerwash wand.
These machines come in different shapes and sizes, but they all have similar features. Possibly the most important feature is the centerpiece which is the swivel. The swivel pictured below is a stainless steel swivel made in Germany and it is a top quality swivel. This allows for faster spinning of the nozzles beneath the shroud which produces a better cleaning pattern. Although it is a more expensive swivel it will last longer over the course of several years. For the contractor this could mean big savings not only because it won't breakdown as frequently on jobs, but it will last many hours longer than a traditional brass version.
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