Glass run channel

A glass run channel is a groove, normally made of rubber or plastic, that is found around windows (most commonly car windows).

[1][2][3] The primary purpose of a glass run channel is to provide a seal for the window.

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.

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A picture of a car window, with the locations of the glass run channels shown on the outside.
A car with the locations of the glass run channels highlighted in red
A 250 mm glass run channel cleaner