Eyewear Care & Ultrasonic Cleaning
Sports Glasses After Exercise: Why Sweat Salt Is Especially Aggressive
Sweat contains dissolved salts (mainly sodium chloride) that crystallize on your glasses as they dry. These crystals act like fine sandpaper the next time you wipe them, and also settle into hinges, where they can contribute to corrosion.
What happens as sweat dries on your glasses
Sweat is largely water with dissolved minerals and salts. As the water evaporates off your glasses, the salts remain behind as fine, often invisible crystals – exactly where your glasses have the most skin contact: nose pads and hinges.
Why that's a problem in two ways
First, the leftover salt crystals act like a fine abrasive on the lens the next time you wipe them dry. Second, salts in metal hinges can promote corrosion over time, which can eventually lead to stiff or sticking hinges.
What helps
The most effective approach is to clean your glasses as soon as possible after training, before the sweat has fully dried and the salts have crystallized. Contact-free ultrasonic cleaning reliably dissolves this residue, including inside the hinges, without needing any mechanical help.
Author: Moritz Weinert, Gründer NURO Labs · Last updated on 8 September 2026