Clearing CSS Values

I'm pretty sure there isn't a way to do this, but i am curious..
I know that i could answer the first question if i had a printer that wasn't out of ink .. but here goes.

First: Are CSS attributes that are assigned to the media Screen inherently assigned to Print even if you point the Print media a different stylesheet?

Second: Is there a way to clear a stylesheet values? basically making the stylesheet null or empty?

You would normally create a stylesheet with media="all" that contains styles for all media types. You can then use media="print" or media="screen" to specify media-specific styles. I usually just use one stylesheet and then use overwrite styles with a media="print" section.

Not sure about resetting styles to the default stylesheet ... I've never run into the need for this.