I completely agree rain x is rubbish , I brought a twin pack of it in Costco at the weekend thinking I would get better visibility in the winter months,but after the first drive in the rain it seems to play havoc with the wiper's in auto mode, & also made the wiper's very noisy, luckily any new product I buy get's tested on my Astra estate first & Being the sort of person that doesn't like throwing things away , I have found it work great on the shower cubicle.