how to clean the lt1 engine?

hi guys.. today l was washing my car and l tried to go under my car and look at the engine for a while and l saw my car s extremely dirty. under the car is all rusted, the under part of engine is all dirty iron parts are all rusted. under the car is alla dirty like all over has oil and black.


l would like to spend my one day to deeply clean my car. what do you guys recomend me to clean my car. what should l use to take those all dirt off..

thank you..