Leather should be maintained in order to preserve the surface protection. If this is not done on a regular basis, the risk for damage will increase, for example grease stains, dry leather and cracks.
We always begin with cleaning the leather with custom-made cleaners to wash off grease, stains and ground-in dirt. When the leather is dry, a new protection is applied that moisturizes and impregnates the surface. The upholstery now has gained an increased resistance to UV rays, dehydration and stains.
How often leather should be treated of course depends on how much the car is used, but once a year is recommended.