Dishwasher soap: Mix together equal parts baking soda, borax (available in the laundry aisle). Use 1-2 Tbs. per load. Each load will cost pennies. Also, use vinegar in the jetdry well instead of the expensive stuff.
How to Clean a Tub - So I cleaned my tub as I would normally would. Then I cleaned it as directed on this site and wow I could still see all the grime come off as I cleaned it this way. I know how to clean my tub now! Stocking up on vinegar (and not just for salads and pickles)!*