Walnut shells did a nice job. I had a large compressor with an aftercooler/water trap that I had to leave when we moved. As most know the air must be very dry or it will clog the blaster. I plan on getting another as soon as I can.

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT