The Deoxit D5 is our "magic spray" that cures the crackles from Aeromic connectors and Transmitter packs.
It's a bigger 200ml size can but just put one little squirt into the connector, hold the connector upright and count to 10, then smack it into a tissue held in your other hand and look at the black stuff it flushes out! Yuk! That's dried-up instructor sweat for you causing those crackles by interupting the signal flow. Now do the same for the Bodypack Tx and also spray a little onto a tissue and polish up the battery tags if you can see them - they can get tarnished by sweaty fingers changing batteries and tarnished tags can cause unwelcome "thunderclaps of noise" through the speakers as you jump up and down.
Every Bench or Site Service Technician needs to know how to clear up the connector crackles - it'll save time and money for everyone!