I had this issue for the longest time before I figured it out, Too Lazy to pull the sensor so I just ran some windex through and it cleared the sensor after some good squirts
One of those youtube guys should do a test of what's in each option of fluid, I think the stuff that gunks up the sensor has some type of anti-gel in it or something.
-9800C is about right

whats in that stuff anyways? Last week I was looking at going to the same orange Rain-X wifey uses. But a friend of mine just bought a lot sale from an auto shop going under and I ended up with almost a full pallet of the blue stuff for just under 1$/gal, Ill be using it for awhile