Put the mixture in a spray bottle and spray the grout in between your floor tiles. Wait for the vinegar solution to stop bubbling and then scrub the grout with a scrub brush or toothbrush. Once the grout is clean, mop the tiles with water to get rid of any leftover vinegar solution.
1 Prick all over with a fork: Prick the potatoes in a few places with the tines of a fork. This allows steam to escape from the baking potato.  Bake the potatoes: You can bake the potatoes directly on the oven rack, or you can place them a few inches apart on a foil-lined baking sheet. Bake the potatoes for 50 to 60 minutes. Flip them over every 20 minutes or so and check them for doneness by piercing them with a fork.
Confidence votes 2.0K. It would take at least 40-45 minutes to an hour to bake a large potato at 450 degrees. I often cut down the baking time to maybe 30 minutes by cutting the potato in half the long way before baking. Be sure to oil the cut side, and place it cut side down on a baking sheet.