my plumber used my hull bucket full of 410 hulls as a catch basin for his pipe threading mechine. I have about 3000 AA 410 hulls covered (inside and out) with cutting oil the sulfated kind. how can i clean them I have tried simple green,denatured alcohol and dish soap. at $.10 to $.12 each I would hate to have to through them away. the outside is easy its the inside of the hull thats the problem (oil and powder dont work so good together)
thank
doc.
thank
doc.

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