Scrim

Cambridge Dictionary defines scrim as “a type of cloth that is loosely woven.” Glass comes in only through the example sentence printed under that definition, in which a loose-weave linen scrim is praised for giving a final shine to windows and glassware.

That example belongs to the dictionary. It shows the word in use, and it is not a line from any glass trade standard. The fabric it names is linen, while the definition itself names no fiber at all: by the dictionary, scrim is identified by its loose weave, not by what it is made of.

The word scrim does not appear in NGA's Glass Technical Paper FB01-00, and no cloth is part of its routine method. For routine glass the paper names a squeegee, used immediately after the cleaning solution goes on, to remove all of it from the glass surface. The pure water technique the paper records names a non-scratching (non-abrasive) brush and a rinse generally allowed to evaporate, with no cloth in it either.

A cloth appears once in the paper, in its paragraph on glass with window film applied: a soft cloth or clean synthetic sponge is recommended for washing, bristle brushes and abrasive cleaning materials are not to be used, and paper towels or newspapers are not recommended. The International Window Film Association's cleaning answer lists a soft clean cloth among its options for washing filmed windows, and a soft cloth or squeegee for drying them. Neither document uses the word scrim. Whether a squeegee is the better tool is its own question at is a squeegee better than a cloth on windows, and what a cloth is asked to do on applied film is covered at can window film be damaged by cleaning.