Yeah that's scary! I used brake cleaner because I thought it would be effective. There was one particular incident about a year ago where no matter what I did with the settings and how I cleaned the aluminum, it would not weld without getting nasty. I finally called up Thermal Dynamics and he immediately asked what I used to clean it. I said brake cleaner and he cut me off and said, "Did you smell sour apples?" I told him yeah and he told me that smell is a toxic gas and can kill me with a few wiffs. He told me the only chemical to clean aluminum that was "safe" was acetone.
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