QueenNinjaMonkey- If you were still interested in sandblasting, a car repair shop that does autobody work should be able to sandblast it for you. I don't know how much it costs. My dad has a sandblaster, so I just have him do my metal stuff.
Wow, that came out nice. How do you clean it?
I just use a damp cloth. I have had success on other chairs by pre-treating the burlap with scotch guard. Then it wipes off really nicely.