Has anyone else been experiencing issues getting a good connection with the charger? I use my detector exclusively in a saltwater environment so I am very careful to clean it with fresh water after every use as well as a saltwater cleaning product called salt-away. However I have found the 4 connecting pads for the charger seem to get a layer of corrosion (can't see the corrosion just assume it's there) on them which I have been cleaning with a Q-tip soaked with alcohol. Lately the alcohol is not sufficient and had to use a tip of a Scotchbrite pad. Anyway I don't want to have to keep scrubbing these contacts as eventually they will wear. So was thinking of some kind of dielectric grease, anyone else have this issue?