Cleaning chassis und underfloor : 1974 Dino GT4

Hello all from Europe ,

I'm planning to do an official presentation of the Dino GT4 but as always i'm running out of time...

The Dino GT4 is a very early one from 1974 with ONLY Dino script , Dino wheels and steering, spare wheel documents etc...
Chassis : F106AL8538
( If anyone has informations about the original configuration of the car, you are welcome...)

Its very sound and rust free but dirty , the dust and oil etc... is as original as the car
So my plan is to clean it properly in order to restore the axles , bushes, complete suspension.

I need your advice for a ground cleaning for the complete underneath of the car, with your experiences about dry ice cleaning, water steam , high pressure etc,...
Please advice me because I'm scared to damage instead of making it better .

Pictures of the car will follow soon...