Best product for treating old vinyl

Get sick of lemons yet, or do they bring you back to riding in Pop's LTD? Someone had a black bench seat for sale and it was gleaming, I commented on how good it looked and he said he (his detailer Son?) bought the stuff by the gallon. Someone help me out here....

In our constant quest for working less on our barracks floor during inspections, we tried Pledge on a waxed floor for that 'extra' shine. It made it so slippery that our Sgt. slipped on it when he came into our room. It was funny until he told us to strip it and wax it again before we could go on liberty. Doh!