Hi
Personally, I wouldn't use the Deoxit. Although the product name suggests it removes oxidation, it does nothing of the sort (Don't believe me ? Take a well-used 1P or 2P coin and spray it with said product. The coin will not go back to clean metal). What it does do, however, is prolong the period over which oxidation will occur on clean metal by forming a barrier (silicone?) to air. This, ultimately, is another contaminant which pollutes the contact.
I use either isopropyl alcohol or the aformentioned Kontak. These solvents leave no residue after evaporation and clean air-borne contaminants. If you do this every 3-6 months this will keep your system performing as well as it ought!