Autoglym was created in 1965.
The best way to clean leather briefcases is to use specialist leather cleaners. Autoglym, Renapur and Astonish are all producers of these products and all can be purchased at Amazon.
Any leather cleaner will work well, but consider the Staples leather cleaner for a good, cheap cleaner.
According to their website, the Autoglym company provides interior and exterior car care products, including wax, paint protective coating and upholstery conditioners.
Pledge, Siege, and Leather Therapy all make good leather cleaners that also condition your furniture. Look for a conditioner/restorer instead of just a cleaning product.
A good leather conditioner might help. Shoe polish might also be an interesting thing to try.
I mention that I live in the USA, because I have thru my research, discovered that the wonderful product LTT Leather Care is not availabe in the US. Sooo.. what do we have to clean our leather furniture that works?
Leather Honey is used on leather to condition and protect the leather. Leather Honey is a product, it is not the type of honey that people eat.
Using a good leather protector will help with this problem Try Ultra Protect from LTT which is simple to use and the best protectioin product on the market
Leather is cow hide that has gone through a chemical process to make it leather
Buy a leather care product such a Mothers Leather Care.
One might further find information about Autoglym from the official Autoglym website. A dedicated agent from there can help those in need of assistance find more information.