With ABPR had complain from Amata City Industrial Estate and Nihorn Plast Company for rust appear in around and corrode at customer employee's car in after our HRSG21 2 days from start up that we are thinking that trouble from our process of cutting, grinding and etc. rust or slag that it was blowing out from our HRSG. We would like to your help to inform and discuss to Vogt& contractor for improve and protect by add the process for HRSG internal path cleaning before hand-over to start up