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A glass run channel is a groove, normally made of rubber or plastic, that is found around windows (most commonly car windows). The primary purpose of a glass run channel is to provide a seal for the window.
Cleaning
Due to the channel's narrowness, glass runs can be difficult to clean (or free from small obstructions like glass chips) without the use of a specialised cleaner.
References
Glass run channel Wikipedia(Text) CC BY-SA