Airborne particles (such as dust and pollen), leaves and bird droppings are just some of the things that could dirty your solar power investment. But does the ascetic appearance of your solar panels really matter? Not only does the grime and debris take away from the appearance of your home or business it also reduces the ability of the solar array to preform at full capacity. The end result is that dirty panels equal power loss which equals less return for the money you have already invested. How much energy loss are we talking about? Depending on the level of filth that your solar panels have accumulated, the energy loss could reach 25 percent.