You probably need to clean it soon.
The good thing about this method is that you will only use non-toxic ingredients to clean your bathroom.
Just a reminder, dont use this method if you have natural stone tiles.

Image by: Andrea Jean Cleaning
The lemon and vinegar are acidic that can etch and burn the stone.
Read on for the full instructions.
Combine baking soda and cleaning vinegar in a container and mix using a spoon.

double-check to rub vigorously on areas with build-up soap scum.
Step 3:
Wear your gloves.
Then get your sponge and scoop some of the paste.

Rub it into your shower door in a circular motion.
Dont forget your handles, shower head, shower valve, and shower faucet.
Use a pretty generous amount to make your work faster.
You will let this sit depending on the grime and the build-up of soap scum in your shower.
confirm that the cloth is fully saturated.
Once you are done, use the squeegee.
If you see some soap scum left, leave the paste a bit longer.