Hello there! Thank you sharing your experience. I understand that you have concerns with your cook top image and i have provided a link below to help with your concerns.
this link will address the appearance
(http://www.samsung.com/us/support/troubleshooting/TSG01001943/)
This next link will address cleaning your unit.
(https://www.samsung.com/us/support/answer/ANS00060833/)
This last link will provide the best cookware to use on your unit.
(https://www.samsung.com/us/support/answer/ANS00045483/)
I hope that you find this information helpful. Thank you for choosing Samsung.^Nic