If the label says:
Mildew Remover: The product simply removes mildew and its stains.
If the label says:
Disinfectant: and says it "controls" or "prevents" the growth of mold and mildew, the product will kill mold and mildew. You need to clean the area before using the disinfectant.
If the label says:
Disinfectant or Antibacterial Cleaner: The product will clean the area and kill mold and mildew. Read the label to see how long to leave the product on the surface (usually from 30 seconds to 10 minutes).
If the label says:
Shower Cleaner: The product will keep mildew from growing.
Use it after every shower. 
Use a disinfectant or disinfectant (antibacterial) cleaner two to three times
a week to prevent mildew from coming back.
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