Clean the glue off the can
. This is also optional, but every brand of sweetened condensed milk that I tried had such a strong glue attaching the label to the can that afterward, the interiors of my pots (stock pot, Instant pot, and Crock pot) were covered in a grimy film from the glue. I'd rather clean the glue off the can than clean it off my pot. I used Goo Gone
and it took about 2 seconds.