A limited, documented trial intended to determine whether an observed condition can be removed by an approved cleaning method without harming the glass or adjacent materials.
GlassRenu · Educational illustration
Meaning and boundaries
A cleaning test is not a polishing test and should not remove glass or a functional coating unless that action is explicitly part of an approved restoration trial.
Why it matters in glass restoration
It helps distinguish removable contamination from etching, corrosion, coating damage, and mechanical abrasion.
Related terms
References
- U.S. National Park Service — Preservation Matters: Stained Glass
Publisher’s original source - U.S. General Services Administration — Cleaning Historic Masonry
Publisher’s original source - National Glass Association — Proper Procedures for Cleaning Architectural Glass Products
Publisher’s original source - Vitro Architectural Glass — Glass Cleaning Recommendations
Publisher’s original source