I used baking soda in my Harbor Freight blast cabinet. They sell bags of it at Harbor Freight.
Visiblity is zero. You basically have to guess where the part is or wait for the dust to settle. The dust is so fine it leaks out all the cracks in the cabinet and will make a mess of your garage. Before I try it again, I'm going to weld some casters onto the bottom of my cabinet so I can roll it out in the driveway to use it. It needs to be higher anyways because my back hurts from using it too long.
But it works and does a great job. I like it for parts that are plated and you don't want to have them replated. I did some black phosphate plated bolts and it removed all the dirt and grime but left the plating in tact.
