The first time I used this cleaner, I was able to wear my contacts for 8 hours without any fogging! It was a huge improvement from only wearing them 4-5 hours and then they would fog. I have used this product for 5 days now, each time being able to wear my contacts for close to 8 hours! I have been trying to get used to my scleral contacts for almost a year. Now that it takes moments to insert them and I don’t have to worry about mid day fog I wear my contacts daily instead of every few days. Just 2 drops of cleaner and rub them clean for about 20 seconds, then rinse with saline.