Following clean-up of the Alstom turbine, the VRF skid was removed, and the plant re-installed the electrostatic-type cleaner that had been used before the VRF treatment. A sample from the Alstom turbine was obtained about six months after the VRF treatment and was found to have elevated varnish levels. The GE Frame 7FA turbine was sampled two months after the VRF treatment and had low varnish levels similar to that at the time of the termination of the treatment.