Best non-chemical home cleaners

Castile soap is a great one! There's so many uses for it and ou can find lots of great recipes and how-to's online. I'll back up the claim of vinegar too. Vinegar is a great cleaning product!

Baking soda - great mild abrasive, works better than Comet on bathtub scum.
Vinegar - cleans well, removes buildup, works well to clean up limescale and calcium build up (like CLR)
Rubbing alcohol - diluted, cleans up yucky messes and dries quickly (like cat upchuck)'
Baking soda AND vinegar - clears out drains like drano!