In general, what flux types are considered “dirty?
A. All fluxes can be considered as “dirty” or “clean” depending on how you do your definitions. High solids rosin fluxes have higher amounts of halide activators, but the rosin provides a certain amount of buffer protection. Water soluble fluxes are often more aggressive, but more easily cleanable. Low solids fluxes are lower in harmful residues, but excessive amounts can still cause problems.
