If your pits still smell when exiting the shower, you just gotta get back in and rewash. I had this issue back when I used scented products and strong antiperspirants, it was difficult to get rid off the old gunk because it was properly matted. Unscented and gentle products are easier to wash away and to notice what is sweat and what is old product.
Is scrubbing them with soap proper enough, or should I be using some kind of industrial solvent?
If your pits still smell when exiting the shower, you just gotta get back in and rewash. I had this issue back when I used scented products and strong antiperspirants, it was difficult to get rid off the old gunk because it was properly matted. Unscented and gentle products are easier to wash away and to notice what is sweat and what is old product.