Choosing a leather cleaner is highly dependent on the type of leather being cleaned. There are specialized leather cleaners and more general ones that are safe for many leathers. The cleaner helps to loosen and remove dust, dirt, debris, and grime from the leather surface. This ensures that when you apply the conditioner, it’s not trapping any dirt in, and instead going right into the leather where it needs to be.
Be sure to check that whatever cleaner you might use is safe for the type of leather being used on. And always try it on a small, out of sight place first on the leather to test for any potential adverse reactions or issues with the cleaner and the specific piece of leather you’re using it on.