If you think that you'll be treating a few abused interiors buy the larger size bottles. IMO there is nothing else on the market that can actually make hard leather soft again like Leatherique can. Before using rejuvinator oil make sure the area is cleaned very well, use the water:woolite solution, scrub, wipe, allow leather to dry, apply rejuvinator oil, and then then prestine clean after a few hours. Like Boss said it works best in the summer with the windows up but you can also use a ceramic heater a few feet from the leather surface, just be careful. The price is alot but to have them on hand is a major plus and when you see the turnaround you'll know it was worth it. BTW in the time the Rejuvinator oil is working you can be working on the exterior.
