what kind of paint.how do i clean it?
There are tips on painting a bathtub here: https://diypaintingtips.com/how-to-paint-a-bathtub-yourself-a-complete-diy-guide/
Here's a video that may help: https://www.youtube.com/watch?v=sYb-tCaeTh0
I used tub and tile paint on my sink and it worked well. You can see it here: https://thehoneycombhome.com/transform-your-bathroom-with-sink-paint/
There is specific paint for tubs! It should be available at your local hardware store.
Hardware stores sell tub paint made for painting bathtubs!
We have used the RustOleum kit on a few tubs. I highly recommend using it. Follow directions exactly, 2 people is better than 1, invest in a good mask, and vent the area because the fumes are intense.