Im unsure of your question. Do you mean to protect leather? Mink oil, saddle soap are just a couple of products that help protect leather. I hope that helps.
What is a white leather office X?
Do you mean a chair or couch? My advice would be to add a slip cover, blanket or some kind of protection.
Clean it frequently with a good leather cleaner, then follow with a good leather conditioner. Don't use anything that is for leather and vinyl, you want products that are strictly for leather. I use Lexol products, they have done good for me for years and are easy to use with good results. It keeps leather clean and soft and supple to keep them from cracking so quickly. They also have good products for vinyl cleaning and conditioning.