Hi Sushant,
Thank you for reaching out to us and we are glad to know that you are using Samsung products. We apologize for the inconvenience of having difficulty cleaning the stains. Don't worry will surely notate your experience about this matter for a better service in the future.
I highly recommend visiting these links for basic troubleshooting steps:
https://www.samsung.com/us/support/search/?query=Range&referrerPageUrl=https://www.samsung.com/us/support/
How to clean your Samsung gas cooktop:
https://www.samsung.com/us/support/answer/ANS00049945/
Clean and care for your Samsung electric cooktop:
https://www.samsung.com/us/support/answer/ANS00060833/
How to clean your Samsung oven:
https://www.samsung.com/us/support/answer/ANS00049011/
If repair is needed, please take note of your warranty coverage:
https://www.samsung.com/us/support/service/warranty/NX58H5600SS/AA
If you need further assistance, please reach us through the following options:
1. Facebook Messenger: http://m.me/samsungsupport
2. Twitter: https://twitter.com/messages/compose?recipient_id=18768513
3. Samsung Community: https://us.community.samsung.com/t5/Samsung-Community/ct-p/us
Reference Ticket number: 1144485218
Thank you for choosing Samsung. Have a great day.
-Trisha-