If it is colder then Seafoam in the can will work great.
You know your not supposed to use additives containing alcohol right? Seafoam contains alcohol...it is one of the "petroleum distilates" they list.
I have had this "red" argument with people before...always the same "answer": "it can't turn it THAT red..." IMO, if the trooper is looking to get you and you even have a tint of red, your toast. I live in PA and have never been dipped in this state, but I have been dipped NUMEROUS times driving through the midwest states...and that is in my 2500, a very non-commercial looking truck.
steved