Use undiluted or up to 10-fold dilution
Dilute up to 1:10 depending on the degree of rust on the surface.
Note: Try three-fold dilution first. Then check the degree of rust removal and adjust the dilution accordingly.
Soak and rinse
Note: If the KC-12 deteriorates, replace it with new fluid rather than adding more.
Use a hard plastic container for soaking the workpiece. Avoid metal containers.