Things You Will Need
Commercial products are available for cleaning vinyl trim, but they can be abrasive and expensive. Instead, thoroughly clean your vinyl window trim with common household products.
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Pour 1/4 cup dishwashing soap into a quart-size spray bottle. Fill the bottle with hot water and shake the contents to mix.
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Spray the window trim with the soap solution and scrub the trim with a soft-bristle brush. Rinse the window trim thoroughly with cool water. Use a water hose if you have one handy.
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Pour 1 1/3 cup white vinegar into a quart-size spray bottle. Fill the bottle with hot water and shake the contents to mix.
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Spray the window trim with the vinegar solution and use a soft-bristle brush to scrub the trim. Vinegar is particularly suited for removing mildew from vinyl siding. Pour cool water over the trim to rinse the vinegar off.