I wash my peterbuilt tractor at home is this a deq issue?

albany41m asked: I USE HOT WATER AND DISH SOAP TO WASH MY 2003 PETERBUILT. I HAVE HAD SOME NEIGHBORS SAY THIS IS AGAINST THE LAW. I JUST WASH THE SHEET METAL LIKE YOU WOULD YOUR CAR AND DO NOT USE COMMERCIAL CLEANING CHEMICALS. IS THIS A ISSUE IN THE STATE OF OREGON.