How do u get ride of rust from under your car?

put it on a lift and sandblast under the car and spray some undercoating on it.How do u get ride of rust from under your car?
sandblast it then use a protective coatingHow do u get ride of rust from under your car?
You have to get under there with a steel brush and scrape it. And also a wirebrush drill-bit driven by a drill will get it off. Make sure to wear goggles and maybe a surgeon's facemask. It will be messy, then use an under coating spray, you can get them at an autoparts store.