Open your window, remove screen and chunk the printer out the window.
That i'll delete it.
Ok, now the real way.
Goto the system preferences>print and fax, select the printer/s from the left hand side of the page and click on the "-" (minus sign).
If you think that doing all of this will improve your printing system by deleting and re-adding the same printer with the same drivers, you're wasting your time.