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Old November 4, 2008, 09:42 PM   #2
Unclenick
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Join Date: March 4, 2005
Location: Ohio
Posts: 21,022
It is not harmful on steel below about 10% solution in water. Small amounts actually protect steel from rust when in solution with water. Higher concentrations, though, like any strong alkali, can do some etching. I expect the main problem encountered is that it degreases so well that it will leave steel vulnerable to attack by rust after it is gone and if the bore is not oiled or otherwise left unprotected.

I used Sweet.s for many years. I have gone over to Boretech Elimenator. It is faster on copper and has no eye-watering fumes.
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