There's rust under my rear hatch where the black plugs are... how would I go about taking the rust off of the rear hatch which would be the best way to go about doing it....

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1987 IROC-Z
G92, LB9 305 TPI, 3.23, Bright Red with Carmine Interior, Pioneer DEHP47DH CD deck.2 JBL DS645 4*6 (F).. 2 JBL DS965 6*9 (S).. Soon to get new 305 TPI