Boron plated out of the cleaner, leaving a sticky residue. The operators were manually removing this residue from the parts, oftentimes cutting themselves on the sharp edges of the engine block. The boron also plated out on the rollers on the transfer line causing many hours of clean up.
The customer is an automotive Tier II supplier of axles and transmissions in Mexico. Salty residue was occurring with the heat treatment washers due to the cleaner being used. The tank needed to be changed after four weeks and the parts needed to be double-washed to remove the residue, often manually