newBgeek idea is not bad, and even easier to be done.
the harder way:
get to the passenger side, and look under the dash.
you will see a foam cover held in place with 2 plastic screws. remove them using a flat screwdriver.
remove the foam cover
remove ac vent.
remove 2 6mm screws from blower cover.
move the wires, and slide down the blower assembly.
now, when the assembly is on the car floor, disconnect the electric connector.
spray the motor and clean the fan using CRC contact cleaner.
put everything back in reverse order.
when installing the ac vent, start with the passenger outlet side.
good luck.