quick solve for GTS/black engine grill water spots
 

shocked out how easy this worked. i do not work for the company just think if you see something that would help others you point it out

http://www.autopia-carcare.com/1z-97...l#.V7szh00rKUk

and the nextzett version:

https://uedata.amazon.com/nextzett-9...words=nextzett