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Ralph Mowery

In article ,
says...

This might be a good use for Chip Quik--it's a bismuth-based solder that
drops the liquidus point of a joint low enough that gentle use of a heat
gun will melt it.

Just make sure you get the type that is made to help remove solder.
They make all kinds of solder type products. Some are just tin/lead and
will not help in removal.

From what little I have looked at it, the removal type is very
expensive .