Whitening cream for White leather shoes

I just can't find any Whitening cream for White leather shoes. I bought the shoes at a Central but they only had cleaners.

I'm currently using an expensive Japanese cleaning fluid and toothpaste and a toothbrush to get a lot of the dirt off... but the shoes are gradually losing their whiteness. They don't look good.

If you know any place in the centre (near a BTS/MRT) that sells something like this. I want to hear from you.

Thanks!