what is the best way to clean raw egg off a leather jacket?

Undiluted White Vinegar should work to clean off the raw egg just sponge on and leave on for about fifteen to twenty minutes then sponge or use a clean cloth that has been dipped into warm not hot water when removed dry with a dry cloth Good Luck !

How To Clean Raw Leather

"Very gently scrape the excess egg. Mix a solution of mild soap in lukewarm water. Swish to create a great volume of suds. Apply only the foam with a sponge. Dry with a clean cloth. If a grease stain remains, powder the area with an absorbent such as corn-meal, allowing enough time for it to work. Gently brush it off and repeat if necessary. On leather only, follow with Tannery Vintage Leather Cleaner & Conditioner or Fiebing's Saddle Soap to condition the leather."

You will probably have to take it to a dry cleaner that specializes in cleaning leather. You might try a leather cleaner, usually sold in leather shops.

Kelley R was doing great until the last part about the vintage conditioner or saddle soap- neither of these products should be used on furniture or garment grade leather. Other than that their directions seemed very good.

Let it dry completely and use a soft bristled brush on it. At the local shoe repair shop or at a good shoe shop you can get these brushes for cleaning leather and suede. That should do the job for you. If still some stain on it - was with a damp cloth until it comes off.

If the jacket is a shade that may not stain(black), vegetable oil or peanut oil will smash down the gum and you will wipe it away. comparable theory as getting gum out of hair.

try leather cleaner?