Make a mixture of 1 gallon water, 1 cup household bleach (Clorox, etc.), and 1 cup white wine vinegar. It's a cheap and very effective disinfectant - use it to flush out the water line and clean the ice maker in your refrigerator. Also works great for eliminating the black mold growing in the grout lines of a shower stall.

Bleach by itself has long been used as a disinfectant, but adding the vinegar to it changes the pH factor (makes it slightly acidic), magnifying the antimicrobial effects.