Tips for Balenciaga leather restoration

Hi everyone! I’m not sure if this is appropriate content for this thread. I used to be a member of the original RL and learned a lot about bag care (shout out to the ingenious lady who taught us how to re-plate gold hardware) so thought I’d ask here:

Can anyone give me tips on how to reduce the discolouration on this Balenciaga city? As you can see the handle is the most discoloured/grimey but the corners don’t look great either.

I haven’t tried anything yet as wanted to gather as much sage advice as possible 😊

Thanks!