umm...I think there is a easier way to take the bumper off. I take mine off all the time (about 5-8mins)
-bumper lights off
-four bolts behind bumper lights
-two bolts behind each headlight in the engine bay
-two screws on both sides by the wheel well where the bumper meets the fender.
- the 4 or 5 plastic screws where the vents are
-3 bolts near the radiator under the car.
the bumper should come out no prob.
you don't need to take fender or guard out.
i'd be careful if using alcohol i've used alcohol to clean plastic before and it fogged the plastic. But just my opinion.