Want to clean my intake manifold inside and out since I have it off the truck.

Can I just dunk it and soak over night in a tub? If so...to make sure it's dry in and out...best way to make sure all the water/debris/cleaner is rinsed out and dry? (I'm guessing running my leaf blower through it on a warm day might be reasonable here)

 

I think the intake is ABS, so excess heat wouldn't be good and be careful of the solvent/degreaser you choose - you should try it on an exterior portion of the manifold to see if it reacts. With the manifold being plastic, you shouldn't need to soak it for any length of time, dip and wipe should suffice, not much sticks to ABS.