Rags, tie wraps, and safety wire are examples of what type of contamination?

3 answers

Contamination where? In what?
In case you didn't already know VASTS has to do with aerospace and what not...this was one of the questions on our discussion forum....this is exactly what it says--
Rags, tie wraps, and safety wire are examples of ______ contamination?
....there was a similar question that read:Residues, chemical outgases, and contaminated fluids are examples of this type of contamination.(and the answer was "molecular"
please answer this questionnnn!!!