This is what we use for most cleaning (initially used as part of my daughter's 6th grade science fair project). It is cheap (my favorite) and non-toxic.
1/4 cup white vinegar
3/4 cup warm tap water
1 tablespoon baking soda
10 drops of tea tree oil (antibacterial, antifungal, etc.)
2 drops oil of lavender (optional) (antiseptic and smells nice)
For extra scrubbing, I make a paste with salt, baking soda and vinegar.