You will need to remove it.
consider using waterproofing before applying you next silicone coat then use Siliconized water based elastomeric acrylic.
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Mildew may be cleaned from bathtub caulk and bathroom walls the same way. If the mildew extends below the caulk, however, there is no point in cleaning it; it will soon return. Better to remove the old caulk and apply new. For walls, there is less chance for mildew to develop if the walls are painted with a high gloss finish rather than matte. For tile grout, try using a commercial spray-on mold and mildew remover. Run the bathroom exhaust fan while taking showers or running the bath to slow the development of mildew.
Bleach will safely remove any type of mold or mildew stains.
Hydrogen peroxide is effective in removing mildew stains from surfaces due to its ability to break down the mold and mildew. It is a common household cleaner that can be used on various surfaces to effectively remove mildew stains.
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To remove mildew stains from linens, you can soak the affected area in a mixture of white vinegar and water (1:1 ratio) for a few hours before washing as usual. You can also try using a mildew stain remover or laundry detergent specifically designed for removing mildew stains. Make sure to wash the linens in hot water to kill any remaining mildew spores.
To eliminate stains in a shower stall, you can create a DIY cleaning solution using vinegar and water or use a commercial bathroom cleaner. Apply the solution to the stained areas, let it sit for a few minutes, then scrub with a sponge or brush. Rinse thoroughly with water to remove the cleaner and stains.
Shower cleaner is a specialized cleaning product designed to remove soap scum, hard water stains, mold, mildew, and other buildup commonly found in showers and bathtubs. It helps to keep these surfaces clean, fresh, and free from germs.
You get rid of oil stains by using oxce clean
Disinfecting cutting boards: Use a diluted bleach solution to sanitize cutting boards after preparing raw meats. Removing algae from paths: Bleach can be used to kill algae growth on outdoor pathways to prevent slipping hazards. Cleaning outdoor furniture: Dilute bleach can help remove mildew and stains from outdoor furniture. Removing mildew from shower curtains: Soak shower curtains in a bleach solution to remove mildew stains and keep them looking fresh. Disinfecting trash cans: Spray trash cans with a bleach solution to kill bacteria and eliminate odors. Whiten shoelaces: Soak shoelaces in a diluted bleach solution to brighten and remove stains.
Mildew in the shower is a biological change, not a chemical or physical change. It is the result of mold or fungus growth due to moisture and organic matter in the environment.
You will always have to change your curtain once in a while, but heavier vinyl shower curtains resist mildew more. Amazon sells these curtains for a fair price, and they're very nice. They will last you at least a year, if that. http://www.amazon.com/Mold-Mildew-Resistant-Shower-Curtain/dp/B0002U37GM
Bit of spit and a rub
I would use a white mildew resistant shower curtain liner behing the Ruffles shower curtain.