2/ Things to avoid when cleaning your glasses:
Never clean glasses when dry
You will never be able to clean off a splatter or splash when your lenses are dry. When hiking or training, use a little water from your bottle to clean your glasses. Always make sure you run your sunglasses under a bit of clean water before wiping them...it's the best way of preventing scratches!
Hot water should be avoided
Clean your glasses using cold or tepid water, never hot, as you risk damaging your glasses and lens coatings by causing a thermal shock.
Do not use a t-shirt, paper handkerchief or paper towel
If you haven't yet got into the habit of taking a microfibre cleaning cloth with you, don't use a t-shirt, paper handkerchief or paper towel to clean your glasses instead. We strongly recommend that you avoid using these kinds of paper and fabrics as they can easily scratch your lenses.
Stay clear of household cleaning products, disinfectants and acetone
Don't use household cleaning products, disinfectants or acetone to clean your glasses either. These products can damage the lenses and their coatings. The only products you should apply are a cleaning spray for glasses, liquid soap or washing up liquid, which you must then rinse thoroughly.