Since some of our trucks are getting some age I thought I'd share how I'm dealing with it.
Here is the before on my rusted axle:
I sprayed it with CLR and took a wire brush to it on day one.
Jelmar | All Kinds of Dirty, One Kind of Clean
Day two: I sponged rust converter on it and let it sit over night.
I bought what Lowes' had on hand. If I had it to do over again I would have used a spray. Be sure to use gloves, mask and eye protection. This is an acid that you are putting on your metal. If auto zone had not been out of Rust Fix I would have just gotten that.
Day Three: I sprayed the axle off with the hose and wiped off the dust after it dried.
Then I spayed Krylon Tough Rust flat black all over.
Here is the after:
Basically here is the view I take. This is not a fix, it's a lifestyle of dealing with rust. It's going to happen and this is how I deal with it.
Hope this helps.
Peace,
GATR