The only reason I could see for not cleaning your air filter too much is that it could cause the cotton fibers to begin shredding. There is no way a dirty or partially dirty air filter is better than a clean one.............Look on your cleaner that comes with the kit and see what the ingredients are.
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1999 F-350 CC Dually PStroke,1996 SALEEN s281SC vert #380 & 2004 F-150 FX4 Crew Cab
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