Trish is right, a little WD-40 goes a long way towards protecting metal parts.
Sometimes, like with food items, fibrous gaskets, & etc, WD-40 (Kerosene) is not recommended - then use a DESSICANT adsorbent product such as:
Silica Gel ("Sorb-it"

Silicate Clay, Activated Carbon, Activated Aluminum, and various combinations.
These all come in little bags (and other formats), such as you might find inside new shoes, cameras etc.
Be certain to check for compatability when using with food or medications.
Gord