say good bye to any wax or protection you may have had on your car. Also... good bye to your trim after awhile. Murphys oil also attracts dust like crazy, ever see your floors a week or so after using that shit to clean with... ick.
Car soap isn't that expensive, if you want something that leaves a decent shine, buy something like Chemical Guys Citrus Wash and Gloss, and just make sure you dillute it properly.