Number one rule. If it gets wet, let it dry naturally! 

Ok. That’s got the big one out of the way!

Like your own skin, leather can get dry, hard and dirty so you should look after your investment. Fortunately there are plenty of products available to help you out. Most are oil and wax based and profess to soften, waterproof, condition, shine, protect and preserve. 

Personally I make my own leather balms by mixing beeswax with other natural materials like Lanolin and Neatsfoot and as you will see in my videos, I apply it using a finger as the generated heat helps it to penetrate the leather.   Some people use Olive oil, almond oil and even coconut oil. These would probably be good for the leather but I imagine they could become smelly or sticky over time. 

Balistol is a gun oil developed during the war as it could be used on the metal parts of weapons to lubricate and protect from rust and also could be used on the leather equipment to protect it in what were probably harsh conditions for the leather.

The main consideration is; if whether you want supple leather or stiff leather, after all you wouldn’t want a floppy knife sheath or a stiff pair of boots do you. So read the product description to see if it is best for you.

So in short, I believe that most commercial quality leather care products are just fine. BUT don’t squirt liquids directly onto the leather. It’s always best to put the ‘product’ on a soft cloth and follow the instructions. 

If you really need a recommendation, take a look at ‘Fiebings’ products on eBay or Amazon and choose a product best suited to your item. Unfortunately, if I was to mention any single product I will surely get a torrent of opposition.