Rust prevention..

[dnb]

Hello all, I'm in need of a bit of advice re under body rust protection of my FC Sedan. I would like to get the underneath steam cleaned and treated against rust but am unsure how to tackle it.
Is there someone in Melbourne that does this kind of work that I could take it to?
I want it done properly and I really don't have the facilities or knowledge needed to do it myself.
Any help greatly appreciated.
Thanks, Darcy