I just got a new quarter top on my cutlass and was just wondering what would be the best way to care for it.

 

Nothing too harsh - a dishwashing soap mixture or a vinyl top sleaner. use a soft car washing brush and a rotary motion. An electic scrubber with a soft brush will work great. Do a thorough job each time and rinse well, even when brushing.
There may be vinyl top protectants out there - do not use armor all as it will streak your paint when it rains or gets washed.

 

Thanks, I was about to ask the same question about my vinyl hardtop.