I rarely need to do any more than a vigorous rub on a wet piece of kitchen roll which I use instead of the expensive solder sponges. All you are doing is getting the oxidised coating off. You may need to be quick to tin it after rubbing. Check your solder is not lead free as it is horrible to work with, try some nice 80:20 solder.
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Gareth Cutting
XFactory UK : DMS Model Car Club
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