For better savings on your utility bill, keep your solar panels clean. Solar panels are practically silent and since you don't touch them, you can easily forget them. The cleaner their glass panels are, the more clear surface area the sun has to "work with." There's no set amount of time that you should clean them. If you live in an area with lots of wind, dust or construction, they may need cleaned frequently. Some ares may require weekly cleanings.
Be prepared to keep your solar panels clean. The dirtier they get, the less efficient they are at generating power. While it is true that rain and wind can often take care of a lot of this for you, you do need to get up there sometimes and dust them off yourself.
Humans have taken advantage of the sun's heat for thousands of years. A lot of energy can be saved by drying your clothes outdoors in sunny weather. This cuts down a lot on the energy used to dry your clothing in an electric or gas clothes dryer, and linens dried outside smell great.