hmm think mine are now in need of replacing!
Stick them in a warm oven for a bit mate, that will dry them out and you can reuse them .
The air-con clears the screen quickly, but then you have to keep using it to keep it clear.
I find its best to wait a bit longer and leave the air-con off. It takes longer to initially clear the screen, but it keeps clearer longer.
Also the side windows move away from the seals when operated. This stops damage when the seals stick to the window during a frost.