Deerskin Leather I Have A Mix Of Leather Clothing That I Wear Often But Have No Idea How To Clean It Properly?

I have a mix of leather clothing that I wear often but have no idea how to clean it properly? - deerskin leather

Dyed deerskin vest.
Bracers thick leather armchair with painted details from cowhide.
A leather jacket cut.
and suede with a grease stain.
How do I clean these items without going to the cleaners.