Getting Rid Of Rust

So underneath my truck there's some rust I want to get rid of, and I was just wondering the best way to go about it. I was thinking either a fine grit sandpaper followed by some rustoleum paint. Or maybe even a rag with some CLR on it and follow that with some rustoleum? Or is there a much better way?

 

Good to know. I've never personally tried CLR for anything. Thanks!

 

Wire brush it, use this stuff http://www.semproducts.com/Catalog.asp?prod=164 , then rustoleum overtop.

 

Ok awesome. Thanks guys! I love how helpful this forum is!

 

Sand it down till its bare metal. Then paint over top. That is the only way to 100% for sure know its gone.

 

Something called naval jelly... basically jelled phosphoric acid. After it's done, rinse off and a quick brushing with a stiff brush to remove the ferric-phosphate that the rust was converted to and you're left with bare metal that needs priming right away or it will surface rust. It's much less elbow grease than sanding and you absolutely get all the rust so nothing is left under any paint coating.

If the area has a lot of trapped areas, you may want to neutralize it with baking soda after. But if you can rinse everything really well with clean water that shouldn't be necessary.