Well, that claim is true. The upper harder part of the mop perfectly cleans sweaty balls and also extract ingrown hair from armpits which the real men with smelly balls should shave, if they don’t want them to smell like hell.
However, the main softer part of the mop is not as good. It is too small and shower gel kinda goes through it, and you get to squeeze it for quite some time to get any foam. Squeezing is quite exhausting, since you also have to squeeze the handle.
Overall, that’s a nice mop for a quick shower after gym, but for serious home bathing you should get a better mop.