If you're doing it to save money, the recommendation is to use furniture polish, such as Mister Sheen. I tried it and it didn't have the effect I wanted but others swear by it. Sorry, not sure about how to make your own.
Cant quite remember the quanties (sorry!) but i use baby oil and conditioner although i made the mistake of putting more conditioner in and well it comes out and bit stringy still works though.