Can you just pressure wash it after you soda blast if paint wont stick? What about plastic media?

yep with soapy water then wipe it down and use air in those hard to get places.....i did

Definately go get it Soda blasted...wont't scratch or warp the panels so less stress on the metal. It is more $$$ but so very much worth it..when i had my ute project i had it soda blasted and it looked the goods in bare metal!!! got all the rust, paint, and bog out of the car and all the little hidey-holes and crevices!!

ute soda blasting

this is a short clip of the ute as they began to soda blast it. took about 1.5hrs to do and cost a fair bit but was sooooo worth it..BUT once its done you cant touch it with bare hands..have to wear cotton gloves or some other kids of glove as the natural oils in your skin can cause the metal to rust VERY quickly after..