X3 on Caig's stuff, although you can also use 91-99% isopropyl alcohol.
Caig has a whole bunch of products. Some are marketed as cleaners, others as protectants, some do both. Kind of confusing, but I have a large bottle of their D5 I bought 10 years ago that is still mostly full. I also have some of their tiny brushes that fit in to female plugs, but i usually just dip the jack in the D5, insert it in to the plug a few times and then wipe off with a lint-free cloth.