Automater or Apple script to Auto-delete web/chat history?

Hello! Im trying to figure out how to write a very simple apple script or automater task that when run, will automatically clean my Web history, iMessage history, and delete chat transcripts from my other chat app Adium. I know this can’t be difficult. It’s essentially a script that will permanently (skipping trash can) delete several log files.

Additionally, looking for it to be accessible when double clicked AND, if I choose, each time I start my computer. Anyone know an easy script that exists for this?