First one question:

Have your windows previously been cleaned with alcohol or acid (eg Sidolin or cleaner with citrus extract)?

If so:

Alcohol and acidic cleaners not only attack the glass coating (this is usually not noticeable when it's gone) but also the silicone, as silicone is an acid-binding material. The silicone then "greases" out. That means you pull the grease with the silicone lip over the disc from the silicone edge. Unfortunately, few people read the cleaning instructions for newly installed windows (it says, do not use acidic and alcoholic cleaners)

For a perfect cleaning result, please proceed as follows:

  1. Rub silicone joints thoroughly and preferably several times with a damp cloth and dishwashing detergent. (This only has to happen once per window, as long as you only clean with the easyLight and dishwashing detergent in the future)

  2. Clean the silicone edge on the easyLight with a damp cloth. Then with wet fingers under train over strip (see instruction, which was inserted in the housing and picture below)

  3. Foam window (make sure the foam stops on the window)

  4. Pull off with the easyLight (attach two, three times at the upper edge, so that the neck is also 100pro dry and slightly slower just before reaching the lower edge of the window and peel off over the frame s-l-o-w-l-y)

  5. And you have drip-free, residue-free and streak-free shine :)

If these solutions do not answer your question or do not solve your problem, please drop a mail at