Dishwashing soap does not completely kill mildew spores, but it does wipe away the discoloration. After you use dishwashing soap to remove the mildew, always treat it with a solution that kills the mildew, such as vinegar, chlorine bleach or hydrogen peroxide. Combine 2 tablespoons of liquid dish detergent with 1 gallon of warm water. Wipe the surface of the refrigerator gaskets with a washcloth dampened with the soapy solution. Scrub the gaskets with a soft-bristled brush and wipe the surface down with clean water and a washcloth. Dry the gasket with a towel.
White distilled vinegar kills mildew and removes odors from refrigerators. Fill a spray bottle with the white vinegar and spray it directly on the gaskets. After you spray the gaskets, allow the vinegar to sit for 10 to 15 minutes. If you notice any remaining mildew on the surface, scrub it with a soft-bristled brush. Wipe the gasket down with a damp washcloth to remove all traces of mildew. Dry the gasket with a towel to remove the moisture. Do not forget to spray vinegar in the folds and cracks on the gasket.
Chlorine bleach kills mildew effectively and all other types of bacteria. Mix 1 quart of warm water with 1/4 tablespoon of chlorine bleach to create a disinfecting solution. Bleach needs to be diluted, because it can damage the gasket and cause discoloration. Soak a sponge or washcloth in the bleach solution, wipe the surface of the gasket thoroughly and dry it with a towel. Dip a small scrub brush in the bleach solution, and work it into the folds and small crevices to ensure that you kill all the mildew.
Hydrogen peroxide dissolves mildew from the surface, and it works well at targeting large areas of the fungus. Hydrogen peroxide does not need to be watered down. Pour a 3-percent solution of hydrogen peroxide directly on the mildew, or pour the peroxide into a spray bottle and apply it to the gasket. Allow the hydrogen peroxide to sit for five to 10 minutes before you wipe it off with a damp washcloth. Always dry the gasket with a towel to remove the excess moisture.