Fill the Bucket
Pour your vinegar into the small bucket and open the shower door. Depending on the size of your shower door, you will want to use the proper amount of vinegar accordingly.
Dip and Wipe
Dip your sponge in the vinegar and use short and strong wipes to clean as much of the glass shower door as possible. Dip and repeat until all of the door has been properly wiped down. Be sure to take your time while wiping as you will want to make sure the entire shower door is completely covered with the vinegar.
Soda and Water
Mix approximately 1/4 cup of baking soda into the same bucket along with water. Dip the sponge and once again wipe down the entire surface area of the glass door. Dip and repeat once again until the door is completely wiped. Try not to overly soak the sponge otherwise you will be covering too much of this solution on the shower door.
Use a clean microfibre (or lint free cloth such as an old white under shirt) dipped in water as a final wipe down of the entire door area leaving it clean, film free and clear. Make sure you wipe clean the entire surface area of the shower door to remove all of the homemade solution effectively.
If the remainder of your shower (or most sides) are made of glass, you can repeat this same process with great results for all shower glass that has fallen victim to film and soap scum. Just remember to take your time and make the cleaning solution as per the size of the area that you want to clean.
If this homemade solution does not work for you then you will find a whole host of different products that are specifically designed to clean your shower doors. You will find these products at your local hardware or convenient store. All you have to do it wipe the area that you want to clean and then spray on the cleaner. Let is sit for a few minutes and then wipe it off for a clean shower door. Some of these products are scrub free so all you have to do is apply the cleaner and it does all the work for you.