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Unless you really want it all blasted, you can do a very good job using a wire brush, grinder, etc (home solutions) or you could pick up a stand along HF blaster and through some media and do it yourself if you have a compressor and a place to do it. I just used the hand tools and grinder on both my Cuda and Challenger and both came out fine. Use some lacquer thinner or acetone to wipe it all down to get the grease and oil off of it; of get some simple green and scrub it down. I would never spend $250 for something like this.
I spent a few days cleaning my k frame with hand tools and it is still not quite done yet. The inside crevices with 40 plus year of dirt and grease build up is tough to get all clean up. I think hot tank will be better than sand blasting. Are you going to weld up your k frame?
Plan is to weld it yea. I think I may dip all the smaller parts in a dilution of muriatic acid and then clean them up. May even try to find a big enough bin to dip my k member in? Muriatic acid is super cheap and gets diluted 8 to 1 from what I've read?
Don't you have a bathtub at home?
They sell fairly large plastic bins at the local home improvement stores to mix concrete in. They are thick and cheap and big.
Is that flux core wire? If so I found a gas kit gave much nicer looking welds. ( less mess/splatter to clean up afterwards)
No worries, try keeping your tip closer to the material. I have found this one aspect to be pretty critical overall to producing a good weld. Just for the record, not criticizing at all, you are doing well.