Very cool thanks for the tip! Yup the sides and rear have this build-up of brown contaminants that won't come off with normal car washes. I just purchased a Pinnicle clay bar kit from autogeek.net so hopefully that gets the job done.
As for the rear diffuser, the guys did not have to remove the diffuer to wrap but I imagine it would be somewhat easier with it off of the car. Actually without a second pair of hands and depending on how flexible the piece is, it might be more difficult with it off since you have to stretch the wrap a little.
I couldn't help myself. Yesterday, I paid the guys at Rolotech another visit to have a few more accent pieces wrapped which includes the rear license plate opening and fog lights opening. They didn't have time to black out the center piece right below the intercooler but that will be for next week.
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