Are there any instructions for using a low detergent Murphy's Oil Soap
or Cotton Seed oil with water to keep the dust down or dirt auto race
tracks?

Problem with using Murphy's is the condition of the track after use. 
It tends to lose alot of grip and makes it much more difficult to
drive.  I don't know much about Cotton seed oil use.  I'm going to ask
a stupid question, have you talked with other tracks in the area,
asking what they use and how to mix?

P.S.  I just race. I raced a track that used Murphy's and would NEVER
do that again, but it could have been how it was mixed.