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If it's undercoated now...I'd touch it up with undercoating. Mask off the body work immediately surrounding the wheelhouse, remove the wheel and cover the suspension parts.
Or, a spritz of Krylon Semi-flat is an excellent match to clean up otherwise good condition undercoating.
On my '03 Cobra, I use Simple Green to clean the plastic liners, then hit 'em with some 303 on a applicator. On the Bronco, where the reach is MUCH easier, I used Sprayway non-slicone tire dressing and spray it onto the liners. (It's aerosol.)
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