Compressed Air
Compressed air is a great tool to have backstage in the event of microphone emergency. A can of compressed air can bring a microphone back from the dead, commonly used when a capsule has become logged with sweat or water.
IPA Solvent
IPA Solvent is most commonly used to clean flight case labels, however because of its properties can span to many other uses. IPA Solvent evaporates very quickly and is not water based, meaning that it can effectively clean electronics without fear of corrosion.