Even though your glasses might seem clean, rinse them under lukewarm water to prevent scratches from hidden dirt and debris. Avoid using hot water as it may impair any special coatings you have on your lenses.

After rinsing your glasses, gently rub each lens with a drop of mild soap or lotion-free dishwashing liquid soap for at least 30 seconds to disinfect them. Avoid using moisturising soaps as they are known to leave residues behind.

Hold your glasses once again under a stream of lukewarm water to make sure all traces of soap are properly washed away. Any remaining residue might cause smudges later on.

Carefully wipe the lenses dry with a clean, lint-free cloth only . Using paper towels on your glasses might cause scratches while air-drying them will leave a watery residue.

Keep your glasses in a protective case with the lenses facing upwards whenever you are not wearing them. This will protect your glasses from scratches, dust and dirt.