Dishwashing detergents (Dawn, Cascade, Rinse Ad, etc) contain emollients; an ingredient designed to protect a person's hands, by keeping them soft and prevent cracking and drying. However emollients make the paint surface more difficult to dry and leave an oily residue, this thin film, which also aids 'sheeting' from glassware.
The problem is that these emollients do not rinse away and you are left with a thin film on the vehicles paint surface, which will negatively impact polymer cross-linking and its durability. They also contain Diethanolamides, which act as foaming agents or as emulsifiers
Last edited by TOGWT; 08-31-2012 at 12:31 AM.