Cleaning Before Soldering - Two Opinions
This is an issue I have heard differing opinions about. Experts, whose opinions I value, disagree about the best way to clean before soldering.
One opinion is that you should use 000 or 0000 steel wool to clean the surface of copper foil that has visible grime, dirt, residue, or oxidation.
A second opinion is that you should use a Scotch Brite pad, instead of steel wool, because steel wool leaves steel dust that contaminates the solder, which can ruin your project.
An article I read recently concerned rust that resulted from using steel wool to scrub solder lines.
If you have experience with this issue, please leave a comment.
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