My ALL time favorite cleaner is Bar Keeper's friend. It is the only cleaner I have found that takes the black marks from your pans off of white sinks...and almost effortlessly. I also use it to scrub toilets and tubs.
I thought I was alone in this, but when I did a post on our top 3 favorite cleaners a while ago, we received a great response and this same cleaner was at the top of a lot of people's lists. If you check out our post, make sure to read all the comments from everyone - tons of great ideas!