Sometimes, even a commercial dew cap cannot completely protect your telescope from dew. If dew still develops in spite of your commercial dew cap, you can use a small hair dryer, and apply it to your telescope in order to get a warm stream of air going to your lens or corrector if dew develops. The airflow would be just enough to remove dew from your telescope on a cold night. One thing to remember is that it is important to avoid airflow at high temperatures, as this might cause a distortion in the glass.

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