There are about 6 10mm bolts that hold the steel plate to the rubber flange, un do them and the scoop will lift out.
Clean all the dirt with hot soapy water, dry then use metho or alcohol wipe to clean paint work.
Peel off tape and position over holes , replace the flange and steel backing plate , Done.
Have you had it sprayed if not I'd give it a few coats of clear to the natural finish.
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