Place the cleaning disk in your drive and 
turn on the Apple or reboot several times 
to allow for the full 30 seconds.

Oh, wait a IIc is smarter than that...

Turn on the IIc and press crtl-reset to 
get to a basic prompt, "]" then type the 
poke command followed by the numbers below 
and press enter.

POKE -16151,0 TURNS ON DRIVE 1
POKE -16135,0 TURNS ON DRIVE 2
POKE -16152,0 TURNS OFF DRIVE 1
POKE -16136,0 TURNS OFF DRIVE 2