Oh brother! What a waste of money. Personally, every few days or so, I just grab the 99 cent botton of isopropyl alcohol (the 91% stuff) off my shelf and a paper towel. Dab a little alcohol on the paper towel and wipe the keyboard down. Every few weeks, I'll add in the process a few Q-tips dipped in alcohol to get between the keys. Every few months, I'll pop all of the keys off and thoroughly clean the whole keyboard.
Isopropyl alcohol is cheap, dries instantly, leaves no odor, is safe to use on electronics, and it kills 99.9% of germs and physically cleans the surface.