Try this homemade SHOWER CLEANER MIXTURE if you want your shower to look brand new.
One part Dawn Blue, one part White Vinegar. Put in spray bottle and spray surface. Let sit for at least two hours. Wipe clean. Even your rust stains will be gone.
TIP: Heat the vinegar first until it’s hot (1 to 2 mins) for best results. You only have to heat it up when you are combining it the first time; it does not separate. Heating will make it smell. If you can, open your bathroom window before spraying.