Today I cleaned my neighbors Ford Explorer Eddie Bauer Edition, the leather in it had a very high gloss and felt tacky to the touch, the dirt build-up was pretty bad too.
I used OPC 4:1 with a fingernail scrub brush for gentle agitation to help remove the dirt build-up. The OPC could probably have been a 10:1 ratio and it work just as well, but I had a spray bottle with the 4"1 ratio so I just went with that. I followed this with Liquid Glass Connoisseur's Choice (LGCC) Protectant. The LGCC left a much more "natural soft" finish and felt smooth to the touch as opposed to the "high gloss" tacky finish that was previously on the leather. LGCC is made up of a blend of silicones, glycol, special waxes, mink oil, and UV Inhibitors. It has a pleasant, but not over-powering odor, and is guaranteed to last for three months.
I bought the quart size container a few weeks back when it was on BOGO, and this is the first time I have used it. I can't say anything about the "Three Month Guarantee", but one thing I did notice is the amount of product used, a little goes a long way!!!