
As Dogs a Babe said, you could use furniture leather cleaner - but the ones I have used, don't have much of a smell to them which could be a problem as you are trying to freshen the smell.
Saddle soap you can get from a saddlers, maybe even online. You just dampen a soft cloth, rub it on the bar of soap (don't use too much, you don't want it to foam) and rub it into the leather - you can add more if needed. No need to wash off, but use another soft cloth to buff up. It leaves a lovely fresh leather smell - think of clean horses tack! The bar will last you forever!!! ;)
Have you a friend who rides/keeps horses? or a local riding school you can go and beg for a piece of soap?
HTH
Like this
http://www.amazon.co.uk/Leather-Saddle-Soap-100g/dp/B001RP8T78