I would like to know what will be the best way to clean sludge inside solder
stripper chamber. we are using HNO3 based chemistry and we tried different
way like HNO3 with HCl or Sodium hydroxide with sodium glyconate, still it is
difficult to remove all those sludge which not only short the bath life , but
also cause salt stains on the copper surface, even mild microetch has
difficult to remove those white salt spots. Any good suggestion? By the way
compare to Sn-Pb solder resist, The pure tin seems more easy generate the
sludge.

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