Droplets or fragments of cement-, mortar-, grout-, stucco-, or concrete-based material deposited directly on glass.

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Meaning and boundaries
Splatter is a direct deposit, unlike dissolved material carried in runoff, though both may occur together and both can be chemically active.
Why it matters in glass restoration
The particles can harden, trap abrasive aggregate, and expose the surface to high-pH moisture, making forceful scraping hazardous.
Related terms
References
- National Glass Association — Proper Procedures for Cleaning Architectural Glass Products
Publisher’s original source - National Glass Association — Construction Site Protection and Maintenance of Architectural Glass
Publisher’s original source - Pilkington / NSG Group — Glazing and Handling Guidelines
Publisher’s original source