You're not referring to the white grease on the little 'plugs' inside the wiring harness are you? If so, DO NOT clean it off, it's supposed to be there. Most all of your sensors will have this dia-electrical grease that prevents moisture from rusting the terminals while allowing current to pass through.
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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