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Explanation: stray parts gets quite a few hits on google.
Clean dirt and stray parts of the machines.
Spin Jet Parts Washer
... are located directly below the basket to retain heat in the cleaning solution and
prevent stray parts from falling into the tank. Without the trays, the 170°F ... www.kochelequipment.com/Landa/SpinJet.htm - 12k - Cached - Similar pages
Recent application stories
... as appreciative of its self-cleaning. For this application, probably the ... by-products
into three distinct constituents--stray parts and bar ends, cutting ... www.inter-source.com/appstories.htm - 46k - Cached - Similar pages
Feature Article - Chromium Plating
... metal preparation Improve grinding and cleaning procedure Reposition work on racks ... unstable
mist suppressants, or stray parts corroding on the floor of ... www.pfonline.com/articles/pfd0016.html - 58k - Cached - Similar pages
I was going to go with discarded (or unsorted) parts, but stray, particularly given the references Mary provided, seems to fit the context better. Thanks to everyone for your suggestions. 4 KudoZ points were awarded for this answer