I should also note that underarm darkness can be caused by a variety of reasons, such as: stubble from shaving (try waxing/plucking), a reaction to antiperspirants/deodorants (stop using them), hyper pigmentation (theres creams to solve this) and a medical condition called acanthosis nigricans (which typically is found in people who are overweight) However I do think for the most part its dry skin cells stuck in the area as well as a bad reaction to deoderants Body wash: Any, but I love Philosophy shower gels! Cetaphil moisturizing cream- about 10/tub at costco Pumice stone- for feet, can be found at any body store Loofahs- any drug store, youll find them the cheapest at target, walmart or dollar stores Razor- I prefer Gillette’s Venus line 
FTC: all products purchased by me. All opinions are honest and my own. I have no relationship with any of the companies mentioned
