Clearing a config item

[eluser]Jacob Krustchinsky[/eluser]
Hello everyone,

I am using a config file to store all the settings of a site running off of my CMS. Now my question to you is, what is the quickest and most efficient way of setting a config item to blank from a controller. I want to be able to clear the item and then set the item again, maybe my brain is somewhere else right now but I am having difficulty doing that.

Thank you,

Jacob Krustchinsky