Washing-up Liquids (Detergent)
Washing liquids chemistry relies primarily on detergent and surfactant technology. This type of chemistry has advanced to the point that it can be engineered to specific soils (i.e. organic grease) Detergent and soap chemistry and product formulation is a lot more complicated than this, suffice it to say; modern car wash formulations are automotive soil specific.
I would not recommend using a harsh dishwashing detergent on a regular basis, as they contain a degreaser, although most of them are approx pH 8.0 the other ingredients will tend to oxidise the paint system and emulsify, breakdown and leach out oils found in rubber moulding, trim and the paint system, which causes the plasticizers to dry out and oxidize, causing them to lose their flexibility.
The MSDS indicates that these products contains sodium hydroxide, which is highly alkaline the same ingredient used in engine degreasers to chemically ‘burn’ hydrocarbon oils and grease from engine surfaces (sodium hydroxide) it will severely stain aluminium, magnesium, etc. It will emulsify, breakdown and leach out oils naturally found in your paint, and also any oils you have applied in the way of a polish or glaze.
Generally you should avoid the use of household cleaning products for automotive detailing as they are formulated for an entirely different type of cleaning. Your car surface and the dirt that gets on it are a lot different from the food soils and dishes that dishwashing liquids clean effectively. We don't recommend them for cleaning your car.