You may notice that many of the solar grade fluxes and solder pastes are designated 'no-clean'. This classification is used to describe a flux or flux vehicle that does not need to be removed (cleaned) after soldering. In much the same way as the mosquito in "
It might sound scary, but no-clean fluxes are very common in today's electronics assembly – including military, medical, and high-reliability applications. There is no question that electronics assemblers and material suppliers have done their due diligence in qualifying no-clean materials. In the end you can put your mind at ease, modern no-clean materials are classified as such after standardized testing for electro-migration and surface insulation resistance. This testing allows flux suppliers to safely provide no-clean materials that can function well in various soldering situations and eliminate the need for a post-assembly cleaning process.