I’ve been having a problem when making entirely enclosed hollow
forms. I generally drill two small holes somewhere to let the air/gas
out when soldering. After I’ve finished soldering and pickling some
pickle inevitably remains inside the form. I have tried toasting the
things in my (culinarily retired) toaster oven. Some liquid sputters
out, leaving a crusty bluish rim around the holes, but some liquid
always remains inside too. The same applies to the application of
silver black or liver of sulphur to pierced hollow forms.
Does anyone have a good method of really cleaning these nasty
chemicals out of the insides of things and leaving them dry? Are
ultra-sonic cleaners the answer here?