Originally Posted by bassboy

Rain x - my personal favourite. Easy to apply, easy to wipe off. Lasts around 1-2 months if not a tad longer. People don't really rate it highly and suggests is comes off with frequent wiper use. The more you use it the better the results. Water runs off my screen at 25mph and don't need to use wipers above that speed. I found the trick to using it is put the product on all windows, let it dry for about 10-15mins, put another layer on top of the initial layer. Leave for 5mins. Wipe off. One bottle will last you ages. I can probably do 2 cars coated around 30 times each with the above method