What's the best way to clean the leather seats in my BMW 3 Series?

I recently purchased a BMW 3 Series and I want to make sure I take good care of the leather seats. What products and methods do you recommend for keeping them clean and preserving their quality?

I've found that using a specialized leather cleaner and conditioner works best. Make sure to read the instructions and use a soft cloth to apply.

I've heard that using a mixture of vinegar and water can be an effective DIY solution for cleaning leather seats. Just be sure to do a test spot first.