For people with oil in the bath, I’m going to try this. I also saw a vinegar solution that may be less a pain in the ass than baking powder... I’ll report back.
1st green degreaser for oily bathers.
http://homeguides.sfgate.com/bathing-oil-out-bathtub-28475.html
1
Make a thin paste of baking soda and hot water. Start with equal amounts of both and thin it until is about the consistency of grainy mustard.
2
Apply the baking soda paste to the oil ring around the inside of the bathtub, if there is one. Baking soda isn’t caustic, so you can smear it on with your fingers.
3
Sprinkle baking powder over the bottom of the bathtub, the same way you’d use an abrasive cleanser.
4
Wet the plastic scrubber and thoroughly scrub the bottom of the bathtub. Rewet the scrubber often to keep the wet baking soda from caking on the surface of the scrubber.
5
Scrub the baking soda paste off of the inside of the tub where it has been sitting. It’s hard to use as much pressure on the sides of the tub as you can bring to bear on the bottom, so letting the paste sit helps absorb the oil.
6
Rinse the bath tub thoroughly and let it dry. If it squeaks when you run a wet finger over it, you have removed all of the bath oil.
7
Add liquid dish soap to your baking soda paste if it does not cut the oil on its own. Dish soap is designed to be very sudsy and can be hard to rinse completely out of the bathtub, so try the baking soda first.