So l drank cola today and l accidentally poured a little drop of it on my dragon dx goggles. l tried a window cleaner but l made that spot even bigger. What should l do besides buying new lens?
The vinegar did not help it made the hole even bigger and now l can see it from inside. Looks like the cola was in there really bad.

vinegar and water

Rub Acetone on it and some paint thinner

vinegar should take it off, but might leave streaks, so use window cleaner again after that. but your lens has 2 layers separated by a 1/8'' layer of foam, for anti-fogging purposes, (which it does) dont submerge the lens in anything, as it may stain inside the two layers and you will never be able to get at it.

Pee Pee

l am not sure how bad it is & if my answer will help but..

When l bought my new car from the dealership they cleaned it one last time before l bought it but when they cleaned the windows they used a dirty cloth so it left stains & streaks. After numerous times of using window cleaner on it l was disappointed that the stains & streaks were still on my windows. So l decided to try something, l got 2 cloths, 1 wet, 1 dry, l just wiped my windows with the wet cloth & dried it with the dry cloth, then after each window l would re-clean the wet cloth. l was surprised that my windows were finally clean & streak free. For now on l am only using this method when it comes to cleaning my windows.