Yepper!!! Best stuff made next to Fels Naptha. There was also a coal tar soap that was really good but have not been able to find it.
I used Octagon years ago, when I did mechanical work and needed a good, basic strong soap that was cheap, since I used a ton of it.
Last year, Mrs. B got some poison Ivy, ahem! on her lower regions ( don't ask! ) and that was the only thing that did a halfway decent job of getting the oils off of her.
It's getting hard to find around here- the area is getting gentrified by folks from the big cities, and only one Winn-Dixie still carries it.