This is a picture of the icky, possibly sentient, black line along the base of the tub in my children's bathroom. The caulk there is old, and it's just not coming clean. If only I could get it at least a little closer to its old, white self.
Wait a sec. Didn't I just totally remove a bad stain (like a boss) from my mattress? Why, yes. Yes, I did. I wonder if the same peroxide and baking soda combination would work here. Let's try it!
Into the spray bottle went 4 ounces of peroxide and 1.5 tablespoons of baking soda. Unfortunately, the spray bottle sucked (yay dollar store), and I wound up pouring the solution onto the stained area.
After 10 minutes, I gave it a good scrub.