I went to the local Harley dealer and the salesman told me "off the record" that while S-100 is a great wax, it was more suited to the small surface areas on bikes vice the much larger areas on the Z. Also, I had some swirl markings to get rid of. He recommended Zymol as a better fit for me, especially on the cleaner side. Used it over the weekend and it really does a good job on the marks and shines well...