Clearing Smarty properties

I'm using Smarty for creating mailing list messages. In order to save  
instantiation overhead in the sending loop, I'd like to use a static  
Smarty instance and reset it each time around. Is there an easy way  
of clearing all smarty properties (like a $smarty->reset() function),  
for example removing all assigned vars? Or do I have to just clear  
them manually?

Marcus
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Marcus Bointon
Synchromedia Limited: Creators of http://www.smartmessages.net/
[email protected] | http://www.synchromedia.co.uk/