First, whisk together the sweetened condensed milk, scraped vanilla beans, and salt; then set aside.
In your chilled mixing bowl, whip the cream on medium-high until firm peaks form, this will take about 3 - 4 minutes.
Fold about a cup of the whipped cream into the sweetened condensed milk vanilla mixture with a spatula until combines then fold that mixture back into the whipped cream until blended.
Pour half of that mixture into the chilled metal loaf pan, then add some of the dulce de leche in there. Then cover with the rest of the whipped cream mixture, and add some more dulce de leche on top.
Using a wooden or metal skewer, swirl the dulce de leche in the ice cream to make sure it is evenly distributed.
Cover the metal loaf with saran wrap and freeze for 4 to 5 hours. This will ensure that it is solid and scoopable! When ready to serve this ice cream top with some extra dulce de leche drizzles.