Reviving leather bag

I brought a great 70s handbag of TM but it is a little more worn then I expected. It is mainly white with coloured patches. Is there something I could use to try and whiten the white patches without ruining the leather? and also whiten up the inside lining?

Use leather furniture cleaner. We had a white leather lounge suite which came up fab after using a leather cleanser. Otherwise just sunlight liquid, it depends if it is dirty or if the leather is damaged though I guess.