It's grilling season! An easy way to give your grill a quick clean: after you are finished grilling, but while the grill is still hot, hold a ball of crumpled foil with tongs and use it to scrub the grates. Viola! A cleaner grill with minimal effort!
One note: this will only remove the newest layer or two of buildup, so if your grill is particularly in need of a cleaning, you may have to take a more drastic approach.