Sandblasting is a viable option. Just know that in no way is it cheaper nor quicker when you factor in everything you need to do both before and after. Now if the cab is very rusty you will most likely go this route. Otherwise what AcampoDave does works well.
I've learned that if you sandblast you will need to vacuum the easy stuff first. Blow the hidden stuff as best as you can. Then vacuum what you can. Repeat until satisfied. Then put the thing on a trailer and drive to Canada. By then all the rest of the sand will have shaken down to be vacuumed again.
Good Luck