Update...I read on line to try adding cola to the detergent which I did and soaked it for about 30 minutes, that didn't work.  I then tried soaking the skirt in lemon juice and detergent, that didn't work.  I think I'm going to return the skirt...The skirt is beautiful, the material is what I expected for the price, I will use a slip, the material is pretty sheer.  The real problem I have is the intense odor of petroleum.  I have washed it twice and used twice the amount of fabric softener.  I am going to soak it by itself in detergent, if that doesn't work, I will be returning it.