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How do you clean and demagnetize your tweezers?
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KL27x:
I love freshly cleaned tweezers. But I learn to get by in betwixt cleanings. Flux residue on the tweezers can be useful, or at least more manageable, when you learn to heat the tweezers with your iron.

When doing SMD assembly, it usually helps to use a pickup tool, anyway. Once the parts are flat on the board, it is usually no problem to manipulate them even when your tweezers are sticky with flux. The flux is annoying when you pick up a part wrong, to begin with. In this case, touching the tweezers with your iron can help the part to let go. By placing the tweezers at the right height and orientation, you can try to aim for the part to land rightside up when it releases.

Also, when your tweezers get stuck together in the closed position, a quick touch with a hot iron is often all it takes to get them to open.

When a decoupling cap goes missing from the board, I heat the tweezers briefly (under the microscope) and then quickly poke and snatch the tweezers into a pile of ceramic caps, and usually 1 (or sometimes more than 1) come out with the tweezers, due to the flux residue on there. When I'm soldering SMD PCB, everything is based around the microscope.
james_s:
I clean them with acetone or a similar suitable solvent for whatever they are contaminated with.

To demagnetize any tools that I don't want magnetic I use my degaussing wand that I got back when I was working on a lot of CRT monitors and TVs.
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