Chemical compatibility.
So all you got out of that was that I build pumps? Why do you think I included the names of OEM suppliers of carwash equipment and supplies? They sell soap for car wash facilities, check out their soap and Dawn and see if there are any similarities. Chemical compatibility.
If the material and elastomembers in the pump are not compatible with the material being pumped the results are pump failures. Unhappy customer, warranty work, loss of business, and a bad company name. Chemical compatibility.
Automotive finishes are applied to cars by pumps, through many applicators such as spray guns, turbo bells, and dip tanks. Chemical compatibility.
None of that work was done without knowing how any chemical reacted to other materials such as soap on car finishes. Chemical compatibility charts are available for confirmation of what will or will not harm another material, check it out.