I started doing this and will never stop! My tub shower are always spotless-so simple. Simple shower and tub cleaner: fill wand half and half. Wet surface and scrub. wow! leave in shower wash while you are already in there - This SO needs to be done in our bathroom.
Your dishwasher washes all the food off your dishes. But who washes the dishwasher? You can, by pouring 1 cup of vinegar into the bottom of the tub and running it through a cycle without any dishes. Doing this once every month or two will remove built-up soap residue and keep it in squeaky clean shape.