Micawber
Well-Known Member
Start with the saddle soap, Vaseline and other softeners first before moving onto mild and progressively stronger solvents. Cheap and cheerful white spirit could work but if they've ever been bulled then it may struggle, also may leave a white powdery residue that you will need to get rid off. Acetone will shift it for sure but could possibly lift any finish and or colour dye. There's a whole range of stuff you could try but some have the potential to go too far, I'm not listing them here as I don't want to be responsible for someone removing the finish and colour from some cherished item or jacket.