Get a little warmth boost by coating the outside of your leather boots with beeswax, using a rag to rub it into the corners. This prevents the outer layer of leather from absorbing water and water from pooling between your Gore-Tex liner and the leather. End result? Your feet stay warmer, and the leather absorbs less water.
Avoid using other waterproof sprays or waxes because they affect Gore-Tex's ability to "breathe." Normally, moisture evaporates from the leather through the Gore-Tex lining, keeping your boot dry. Beeswax doesn't interfere with this process, but other materials can, so better safe than sorry.
Let wet boots dry naturally, keeping them at room temperature. Don't place them near a fire, radiator or other heat source because this can crack your boots. Super wet boots can take a couple days to dry, but you can't rush it.
Turn your boots upside down and shake out dirt and debris.
Clean stains and mud off the boots using a rag dipped in a bucket of warm soapy water. Use gentle soap to avoid harming the leather.