Hi Mary.
Thank you for reaching out regarding your Samsung - 27.4 Cu. Ft. Side-by-Side Refrigerator on how can I clean it. The black stainless surface and inside. Regarding your concern, use a clean, microfiber cloth, and if necessary, a damp cloth with mild detergent, and be sure to dry everything when you're done thoroughly. For the exterior of your refrigerator, if it is is stainless steel, use a stainless steel cleaner or polish like Bar Keepers Friend and a soft clean cloth. Make sure to wipe along the grain of the surface.
Here is the link to further assist you.
A plan for keeping your Samsung refrigerator clean
https://www.samsung.com/us/support/answer/ANS00079481/
Also, here is a link to your user manual for further assistance. Please go to page 42.
https://downloadcenter.samsung.com/content/UM/202002/20200209000842125/SBS_RS5300T_DA68-03958J-01_EN_MES_CFR.pdf
Should you need more assistance, please feel free to get back to us via 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
Thank you for being a valued customer of Samsung. Have a great day.
Reference Ticket Number: 1144319773
^Camille