So.. you know what it's like.. All the singers fill your microphones with saliva and last nights dinner.. They smell fantastic.. I came across these tips from shure about how to clean your vocal microphones.... Have fun... Cleaning an SM58.. The best way to clean this microphone is to remove the grille. Most vocal microphone grilles like the one on the SM58® simply unscrew. If the grille doesn't slide off easily, gently rock it back and forth while pulling it away from the cartridge. Do not pull sharply or with excessive force, since that could damage the cartridge or separate it from the microphone housing. Once the grille is removed, it can be thoroughly cleaned without damaging the mic. Since most of the offensive material on the grille comes from the human body, plain water should be a sufficient cleanser. Adding a mild detergent (dishwashing liquid) to the water will act as a mild disinfectant and remove odors absorbed by the foam windscreen. To remove lipstick and other material stuck in the grille, use a toothbrush with soft bristles. In some models, the foam windscreen can be removed from the grille, but this is usually not necessary since water will not damage the grille. Most Shure microphone grilles have a nickel finish that makes them resistant to rust, and replacing the foam windscreen can also be difficult and time-consuming. The most important thing to remember is: let the grille dry completely before reattaching it to the microphone! Microphones don't like water, and although dynamic mics can withstand small amounts of moisture, a soggy foam windscreen will introduce more than is acceptable. Air drying is the best way to dry the grille, but a hair dryer on a low-heat setting can be used. Care must be taken not to get too close to the grille as excessive heat can melt some windscreen material.