Very, very discouraged today. My stroll bag with all the splattered stains is not getting any better. I still can not figure out what the stains are, and how in the world could be on both sides of the bag and also some inside, what did they do to this purse? Was it on purpose to damage it?
I tried Dawn soap, saddle soap, Murphy's oil soap, laundry stain remover, rubbing alcohol, acetone, peroxide, talcum powder, cornstarch, hand degreaser (what mechanics use), car degreaser (for different uses on vehicle parts). The only things I have not tried are bleach and vinegar.
I have done it to two spots inside, and wow! I can say with all certainly that the Coach leather is awesome! It doesn't even look damaged after all my tries, not even loss of color, I am amazed. I have it in water now and meanwhile I am learning about dyes.... not happy. I guess it was too good to be true.![]()
I tried Kelly's Lynn suede cleaner on the suede inside of an ivory bag and it removed almost all of the ink spots. Tried Soil love on strange grease, coffee, mystery spots on the outside of two bags while they were soaking. Used a fingernail brush and scrubbed. Very happy with the results. I would do it all over the bag because I wrecked a third bag trying to use it just on the spots. Spots came out, but now they are lighter than the rest of the bag. (Still working on it!)
Came across a leather worker website that they use oxalic acid solution to remove dirt, fingerprints and grease spots. They don't recommend acetone (?) Oxalic acid is sold in hardware stores to use for removing rust stains. I am hunting for that leather site link.
This leather degreaser might work too. I might get some for a chair and a jacket to test it out, before I use it on a vintage Coach bag!

Good luck with your project!