I've Got Completely rotten Chassis rails, you can't buy them anymore so i'm having some new ones fabricated then it will have to be put on a Jig and have them fitted. The only other thing i've been told i couldn't buy new anymore was the Actual Anti Roll Bar. Everything else i've replaced on the rear beam.

I think sandblasting would be the ultimate way of cleaning the underside of the car, speak to Lamb chops as hes been using WD40 to clean the underside of his.

Wouldn't worry about whether they're rotten or not just get underneath and find out for sure it's not the end of the world!