Maximise your solar investment. Dirty solar panels can reduce their effiency by as much as 20 percent. Dust, grime, pollen, car emissions and sea salt can accumulate on your panels. Rain won't keep them clean, in the same way rain won't keep car windows clean. Our low water technique uses less water than waterfed brushes which is good for environment and less overheads means you save money too. Clean gutters can help reduce damage from over flowing water when it rains and reduce fire hazard when the heat is on. Squeaky clean windows.