Use GT12 thick concentrated gentle cleaner. This cleaner is a natural honey colour and contains glycerine which will soften the leather, use with a soft nail brush and gently stir it onto and around the surface and into any creases and cracks, leave for about a minute, gentle stir again DON’T SCRUB, and wipe off with a damp cloth, repeat if necessary, this will leave your leather clean and soft, ready to apply the conditioner which will keep it soft.