I was about to use Auto-RX (great reviews here)and was searching on the net for the opinions of others and this is what I came across. Apparently Auto-RX MSDS number is 68440-09-5 and if you search, Shell Oil has a product with the same MSDS number and it is called ENSIS-RX (note both these products has an RX in it) and it is a "solvent-based rust preventative". 68440-09-5 is oxidized wax - whatever that is. So is oxidized wax the active ingredient?
http://townhall-talk.edmunds.com/direct/view/.ef125e5/50
http://townhall-talk.edmunds.com/direct/view/.ef125e5/50