Proper leather shoes

My Meindl hiking boots are in need of some TLC. However, I'm in Perú and even if I could find some sort leather treatment I don't want to have to carry it or spend much money on it.

My options seem to be;

1. Clean and then ask a shoe-shinner on the streets to polish then. I'm guessing shoe polish will have some sort of nutrients,
   
2. Find a substitute that I'll use in my general travelling - moisturiser seems like the obvious choice.
   
   

Would using sun cream or body moisturiser fuck them up? Are there any other usually cheap supermarket substitutes?

... Or am I best off going with the shoe shinners?

I also might be able to get someone to bring something out from the UK for me, does anyone know of anything that comes in tinny sachets?

Answers on a postcard please.

Cheers.