I found this on pintrest, so I figured, why not?!?
1 cup vinegar – heat up in the microwave for 2 min
4 TBSP of baking soda – add it to the vinegar SLOWLY! I mean, mega slow. Otherwise you’ll have a volcano on your hands. Mix well.
1 cup dish wash soap (like Dawn). Mix again.
Pour into bathtub.
Let sit for 2 hours.
I was hoping to not scrub at all, but I had to a little.
It totally worked!