Stuck in boot loop - how to clear cache?

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http://forums.androidcentral.com – Ok... so I'm stuck and I've been googling and playing with this thing for about 4 hours now.. I'm stuck. Basically I got S-OFF, installed the stable cyanogen release and got it up and running. I was having a few issues and just decided to go back to my stock installation. I downloaded the RUU package and flashed the ROM onto my phone. Rebooted, the white HTC screen comes up, and reboots, and reboots and ... well just keeps going. I can get into the HBOOT (volume down + power) and I can see the menu, but if I select RECOVERY or FACTORY RESET the phone just goes back into the reboot loop. (HowTos)