Don't listen to the other guy. Yes, you go to the temple, and yes cleaning the statues will gain you a single favor point with each available god, however, it's much more efficient to select "inspect statues" and worship a god, scrolling back and forth until you get a favorable prayer.
Both options have their pro's and con's if Divine favor is your main goal inspecting and praying are great, if you are working on leveling your temple level, trying to gain money and divine favor is a bonus cleaning works fairly well.
