2/3 cups Dawn Dishwashing Liquid
2/3 cups ammonia
6 Tblsp baking soda
2 cups warm water
Mix everything together and pour into a spray bottle.You can get one at Wal-Mart for about a buck.
Before you go to use it...if it's been sitting for awhile...give it a good shake. It does tend to separate a bit, but after a quick shake it's good to go.
To use: spray on stains as you normally would. I usually let mine "soak in" for a few minutes at least.