It might not be the best suggestion for you but my last ideale saddle that was in bad condition i sanded with sandpaper.
I gave the saddle a good sanding all over and then washed it with detergent and water to wash the sanded particles off.
It gets really messy!
I then rubbed olive oil into it while it was semi dry and the saddle came up a lovely mottled colour with light and dark browns.
Actually i done this with two saddles and sold them very quickly to the first viewers because they looked really nice!