cache control

Hello fellow TC Drupalers,

Does anyone have a good scheme to auto clear the cache of a site on a regular basis?

I started using the Domain access module on a site, and though it worked fine on my local, up live it keeps losing the domain info:
Notice: Undefined index: machine_name in domain_tokens() (line 87 of /var/www/mysite/public/sites/all/modules/domain/domain.tokens.inc).

I have tried a patch I found for Domain access, no luck.
The only thing so far that fixes it is to clear the cache manually. So.... back to my question.

Thanks,
Mark