.......but not Penetro. I need something for removing rusted automotive exhaust parts but i pretty much need it by tomorrow. Sick of these mail order companies and the closest "rep" to me for Penetro is about 100 miles away. Anyhow, what is the best one that is sold in most local stores. Liquid wrench? I know WD-40 isnt a pen oil at all. Any out there better than Liquid Wrench?