Spray 9 and Fantastic, pretty close to the same idea. As for grease, spray 9 dissolves grease, if it did not cut thru, the next step would be engine degreaser. I have used it to clean cars for years, If you own a light coloured car, say white, once a season, I will give it a scrub with 9.
In fact, I just had to paint one side of our white Gran Caravan, once the fenders were installed, it was apparent that the paint match was quite different, NOT.. the original white pant had yellowed quite a bit. Grabbed the spray 9, a roll of paper towel, spray, wipe, check the paper towel, hmmm, yellow on towel. Several spray and wipe's, door matches fender. It is one of those things, you have to see it to believe it.