Does anyone know to activate noclip on PC?

I can't seem to find a console command for it. Google just returns a Xbox cheat for noclip but I don't know how to do it on PC.

I did not realise that you can only grab the Large Mutant card on the first play through of Dead City... And you need a RC Car, but you don't get the plans to build RC Cars until after you finish that mission.. what the heck!?!

I need to noclip through the no blocked off area.

I would also like to noclip the Ghost Hideout so I can look at the Wolfenstein area, I missed when I did the first mission and you can't get back either!?!