I hated scrubbing bathroom showers and tubs. None of the purchased bathroom cleaners worked quickly. Then I read about a very inexpensive cleanser combo, that turns this yucky job into a quick and easy task.
Using a funnel, pour the mixture into a spray bottle. Spray it on the tub or shower, wait an hour and then wipe the soap scum off.
I bought a nylon bath cloth to make the scrubbing even easier.
Another great idea was to pour the vinegar and soap mixture into a ketchup bottle, so you can squirt it on the tub and also around the toilet bowl. It will drip down the sides for a heavy duty scum cleanup.