Lex's sweat and blood had long since evaporated, leaving no trace behind. His suit was phenomenal, so it would not show sweat stains either. Moreover, Lex's entire back was covered, so nothing of his miserable state was actually shown in barleys recording.
By now, he didn't even need to waste any energy wiping the sweat off his face, for it would evaporate right on his skin. The dark impurities exiting his body evaporated as well. Oddly enough, however, since they were only considered impurities now that Lex had grown much stronger, after evaporating they didn't release a putrid or horrid smell, but actually smelled fresh and relaxing. After all, his body had been refined by the lotus many times, so even the dirt in his body was valuable now.
All of this combined to create the ultimate scene for Barleys recording, so much so that even the dwarf had not realized it yet.