Media Blasting Questions

with the car on a rotisserie it will help to get the media out. i helped a buddy media blast a car on the rotisserie and we rotated it and blew it out with air best we could but that stuff just keeps coming. he ended up putting the shell still on the rotisserie onto the trailer and rotated it upside down and drove it around town for a few miles and it shook pretty much all of it out.