never tried them on the aluminium bits but i have used it to remove shoe scuff marks off the grey plastic center console. they are also the greatest thing to remove scuff marks off painted walls in your house. no more need to walk around with a brush touching up walls like some OCD-case anic:
They're sort of like having a polishing compound on a sponge. They work well for removing furniture rubs, ect. from walls and baseboards. They saved me a lot of painting this past week as we prepared to put our house on the market (gratuitous link below for anyone looking to move to beautiful Charleston, SC).