Soap Scum and Hard Water Spots
Vinegar is the perfect cleaner for soap scum and hard water spots. All you need to do is dip your sponge or rag into white vinegar. Coat the door and continue applying the vinegar. Do your best to keep wet vinegar on the shower door for at least five minutes. This will allow the hard water build up and the soap scum to dissolve and become a problem of the past.
If you have stubborn problems, you can try boiling the vinegar and then applying it. Just be very careful doing this.
Once your door is clean, rinse it with warm water.