MPU is a compound developed to be rubbed onto the work piece with clean tissue and has many different uses a few of which are listed below: Can replace the need for cleaning and activating saving both time and money. Is ideal for clearing burn or other marks produced during the process enabling the operator to simply rinse and continue the plating process. Makes a very good polish on its own. This is a Genuine Spa Plating Solution Spa Plating has over 30 years experience in electroplating