Cleaning leather purse is beating me

what kind of mark is it? for general grime a microfiber cloth with a drop of mild soap in water, wrung out until it's barely damp, then buff dry. never soak it. ink is harder. rubbing alcohol on a cotton bud, dabbed not rubbed, but it can lift the colour too so try it somewhere hidden first. finish with a leather conditioner either way or it dries out and cracks.