Cleaning Soap Scum from glass showers..Naturally

Combine 2 teaspoons borax,1 teaspoon castile soap,3/4 cup white vinegar, 1 1/2 cup hot water, and 10 drops tea tree oil in a spray bottle. Shake to blend. Spray mixture on glass and allow to penetrate. Follow with a sponge or brush. Rinse off. Dry.
When the job calls for a more heavy duty scrub here’s my favorite soft scrub alternative -It can also be used to scrub a toilet :
3/4 cup baking soda mixed with enough liquid castile soap to form a paste, add 5 drops tea tree oil and 5 drops of lemon oil (optional). Apply scrub to sponge for use on shower doors. Allow paste to stay on glass for 5-10 minutes. Spray with vinegar and wipe off with sponge. Rinse off and then dry.