Well I have read through the whole thread and this is what I got out of it.
Basically, water is the only thing you can use to clean your lens. Just read the manuel you get with your mask and it'll tell how to clean it. I won't think you could put your mask in the dishwasher. But like I said, the manuel will tell all you need to know on cleaning your lens and mask. I'm glad I read this, all my friends were telling me to use windex, I guess I have something to tell them now.
Nitrous is like a hot girl with an STD, you know you wanna hit it, but your afraid of the consequenses.