1993 GMC Sonoma Owner's Manual - Page 303

Aluminum Wheels (If So Equipped) Your aluminumwheelshaveaprotective coating similartothe painted surface of yourvehicle.Don'tusestrongsoaps,chemicals,chromepolish, or other abrasivecleaners on them because you could damage this coating.After rinsingthoroughly,awaxmay be applied. If you havealuminumwheels,don't use an automatibJehiclewash that has hard silicon carbide cleaning brushes.Thesebruchnc PSI take off +I protective coating. i White Sidewall Tires Your GeneralMotorsdealerhasa GM WhiteSidewallTireCleaner. You can useastiffbrush with it. Weatherstrips Theseare places whereglassormetalmeetsrubber.Siliconegreasethere willmakethem last longer,sealbetter, and notstick orsqueak.Applysilicone greasewithaclean cloth atleastevery six months. Sheet Metal Damage If yourvehicleisdamaged and requiressheetmetalrepairorreplacement, makesurethebodyrepairshopappliesanti-corrosionmaterialtotheparts repaired or replaced to restorecorrosionprotection. Foreign Material Calcium chloride and other salts, icemeltingagents, road oil and tar,tree sap, bird droppings,chemicalsfromindustrialchimneys, and otherforeign mattercandamageyourvehicle's finish if theyremainon painted surfaces. Usecleaners that aremarkedsafefor painted surfacesforthesestains. Finish Damage Anystonechips,fracturesordeepscratchesinthefinishshould be repaired rightaway.Baremetalwillcorrodequickly and maydevelop into amajor repair expense. Minorchips and scratchescanberepairedwith touch-up materialsavailable fromyourdealerorotherserviceoutlets.Largerareas of finishdamagecan becorrected in yourdealer'sbody and paintshop. Underbody Maintenance Chemicalsusedforice and snowremovalanddustcontrolcan collect on the underbody. If thesearenotremoved,acceleratedcorrosion(rust)canoccur on theunderbody parts suchas fuel lines,frame,floorpan,andexhaust systemeventhoughtheyhavecorrosionprotection. At leasteveryspring,flush these materialsfromtheunderbodywith plain water.Cleananyareaswheremudandotherdebriscancollect.Dirtpacked 6-55 - I