Step 1: Buy A Scrubbing Bubbles Automatic Shower Cleaner
The thing works like a charm, attach it over your shower head, and once a day, just push the little blue button and close the shower curtain... after a few beeps the automated little maching shoots shower cleaner all over the walls and tub.
We haven't had to clean the shower yet in over 1.5 months!
Step 2: Refills
Each refil tank only lasts for about 20 pushes of the button and then you have to go to the store and buy a new refill canister for about $3.89.
Here is a picture of the refill container.
Step 3: Being cheap, I found a better solution
It's clear and is a daily use product just like Scrubbing Bubbles cleaner. It's even almost the same size and contains 32oz. of fluid rather than 34oz.