I've never used this, but might be worth a try
www.frost.co.uk/automotive-rust-products/por15-rust-solutions.html
Also a few products here for rust removal and prevention. Their clay bars are good (sorry GB, but I do tend to the underneath as well - there's usually a more interesting view from there as well :) Never used them as my cars haven't been that bad.
www.bilthamber.com/search-products.php?cname=Corrosion%20Removal
I use waxoyl on brake pipes though. I found out the hard way the consequences if you neglect them on an older car. Saying that I had the starting of corrosion on the rear nearside brake pipe on my four year old (but high mileage) Avensis where it bends sharply after leaving the wheel arch. The plastic coating had been weakened and was peeling off.
Last edited by: corax on Tue 18 Oct 11 at 17:59
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Dinitrol versus Waxoyl, anything else out.. new