Clean shower glass
To clean you shower glass and remove soap scum and white mineral deposits use hot white vinegar to do some of the elbow grease for you.
Note that if your mineral deposits are etched into the glass this method will not remove them.
DYC White vinegar
Warm 2 cups DYC white vinegar in the microwave for two minutes.
Carefully pour into a spray bottle.
Liberally spray hot vinegar on the shower glass. Allow to cool on the glass for 30 minutes.
Scrub with a non scratch scouring pad.
Rinse with water. Repeat as necessary.