I make sure I never let any water get on the leaves.I think this is salt remain from water you spray on your plants im not sure tho
They do look like water spots but under a microscope they look sort of like a clear film and they don't wipe off.can you wipe them off with your finger?? looks like dried water spots..
This is an indoor grow though and I never let water get onto the leaves...I wouldn't worry, seen similar things caused by drops of water staying on leaves under light, sometimes light can cause small burns, those drops work like lens..
FFOF with a 1/3rd daily dose of jacks classic blossom booster that I started after week 1 of flowering.what kind of soil are you using? nutes?