It was around two years ago that I started my 'make it from scratch' frenzy. While most things have been acceptable substitutes for the purchased stuff, some have been close to outstanding! The daily shower spray falls into that category. The recipe below makes enough for a big 28 oz spray bottle:
1/2 cup hydrogen peroxide
1/2 cup rubbing alcohol
6 drops Dawn or any grease cutting dishwashing liquid
2 tsp cheap liquid dishwasher rinse aid (Jet Dry type stuff)
enough water to fill the bottle
This is a fantastic homemade spray-on daily shower cleaner. It effectively cuts oils, dirt and soap scum, dissolving it away with minimal effort. You can spray it on your liner, too. I put the Dawn in last so it doesn't suds up while I'm adding the water to the bottle. If you decide that you want to make a gallon of the stuff, don't add the peroxide until you put it in the spray bottle or it will eventually turn into just water.
If this is used faithfully after every shower, you'll only have to clean your shower once every 6 months or longer. Notice that I said 'faithfully'? Those who can't be bothered to use it after they shower, should be made to clean the shower (slap, slap, slap).
I also keep a spray bottle filled with some mild bleach water. Sometimes I have to hit the bottom edge of the shower liner with that.
Don't forget to label the bottles!