Only a few more days until trichloroethylene (TCE) is banned!
The current range of 'safe solvents' are expensive, and can still lose a lot of fluid through evaporation even when not in use. The environmentally safe solution is to change to aqueous based fluids and ultrasonics.
Water based cleaning products have been developed for all the challenges set by industries from aerospace to medical and these solvent free processes minimise the risk to your workforce. The savings on costs will also make you smile.