Here are a few tips for keeping your wooden calls in good shape and reduce the chance of cracking.

1. Keep your calls away from large temperature changes
   .  After a day in cold weather never put your
   calls close to the heater.
2. Never put your calls on the dashboard of your
   vehicle.  Even in the winter the dashboard will
   absorb a lot of heat, possibly cracking the call.
3. After a day of hunting with your wooden call, I
   recommend that you take your call apart, including
   the reed and wedge, and allow it to dry overnight. 
   This greatly extends the life of your call by
   preventing the constant absorbtion of water.  By
   doing this, it allows the wood to remain more
   stable and you will find that your call will
   sound better.  This also gives you the opportunity
   to inspect the call for any foreign matter.
4. Occasional cleaning can be done generally by
   using a paper towel or soft cloth on the toneboard.
   A q-tip may be run down the air channel from time to time.  I would recommend using a small
   amount of alcohol instead of water.
5. To restore the luster of an oil finished call you can use a high gloss tung oil or a good paste wax
   and buff it to a satin sheen.  If applying tung oil, be sure to wipe it dry after a few minutes or it will
   remain tacky.
6. Change your cork wedge out at least once a season.
7. After the season has ended, I recommend that your call be broken apart and allowed to thoroughly
   dry. Next, place it in a zip lock bag completly disassembled.
8. Acrylic calls experience none of the above problems except for the need of an occasional cleaning.
   You can use either warm soapy water or alcohol.  After the season, break the call down completely
   and store it in a zip lock bag.