talc or similar products doesn;t work for me, i sweat way to much.
It just causes a big mess inside my shoes, or wherever i put them on.

I don;t know about you guys, but asides what was mentioned earlier.
I always keep some personal cleaning hygiene products (soap, shampoo, toothpaste), and change of clothes in my drawers at work.
if Talc worked for me, i'll probably keep a big bottle there as well.

What i usually do, is to refill every Monday, and bring back all the dirty stuff every Friday
So Mondays & Fridays are panniers day
that leaves me Tuesday to Thursday to ride freely