The benefits can be felt only on the highway or other highways because one needs to have a speed of 70-80 km / h, so that the water drops to start running. The situation that you really only in the split second something seen on a full motorway in pouring rain when the wipers come by, have completely lost their horror for me. Because in these situations actually need no longer the wipers. When exceeding 100 km / h It is even so that you more the more it rains, the better the water runs off. The rain is the wiper. The Versieglung a fall on some point that one has even the windshield wipers still out, while all the others have the wipers to maximum. Of course, the slices are not dry as if by magic. It has, of course, the water drops on the window, the run up. Especially at 70-80 km / h, where the sealing starts working on, you need a certain droplet size, so that the water runs out at all. This requires a certain familiarization already, so you do not turn on the windshield wipers of reflection at each drop, but waiting until enough water is there, so that the seal can do its job. Anyone traveling mainly in city traffic, should avoid posting because even tend new wiper blades so that the streak and at 50-60km / h the water drops do not run by themselves. In addition, the sealant wears off by the wipers. Especially when you often tried the streak to come to grips with the wiper wash function. Therefore surely come the many bad reviews
Sorry remained in winter from the hoped-for effect. The salt-mud-mixed that you get through the spray of the other vehicles in the winter on the highway on the disc, the disc smeared unfortunately exactly.
I treat so after each car wash (ie every 2-3 months), the windscreen and the front side windows, the rear window and the mirror. These ~ 5 treatments a year I come with my VW Touran with a bottle / year easy way - rather longer.
