This "recipe" for homemade shower cleaner is so simple, you'll kick yourself for never thinking of this before. At least, that's what I did. I can confidently say I'll never use anything else to clean my shower/bathtub/sinks.
Liquid dish soap (I used Palmolive but cheap store-brand would probably work just fine)
Heat about 8 oz vinegar, pour into spray bottle. Squirt in a few tablespoons of dish soap, gently shake. I shook a little too much which resulted in lots of bubbles. No harm done!
Spray onto shower, wipe off. It's that simple.
I'm embarrassed to say our shower was pretty gross before I cleaned it. I didn't have to scrub at all and just wiped with a sponge rinsed in warm water. This stuff works. I estimate the amount I made cost about 25 cents (I made about half a bottle). Hint: buy vinegar at Costco. It costs $3 and you get a bottle like this:
Ridiculously big bottle of vinegar... because we really needed it. Since buying this massive bottle, I've been researching ways to use vinegar around the house. I'm normally that person who buys the specialty cleaners because they just must work better. I've been trying to save money and use less chemicals so I figured "splurging" on the biggest bottle of vinegar I've ever seen would be worth it. So far, it is because I'd spend about $3 on shower cleaner alone and I still have an almost-full bottle of vinegar. Win win.
Ok, now go clean your shower. It's never been easier. You're welcome.