No quartz-specific approval, chemistry details, or finish limitations are provided.
Why
Windex Original is identified as a hard-surface cleaner, and the evidence gives no indication of incompatibility with quartz. Normal use is reasonably expected to be compatible, but the product’s exact chemistry and the quartz finish are unspecified.
What to do
Use only as directed on the label; spot-test first, avoid prolonged dwell time, and wipe/rinse residue from the surface.
pH
Not stated in the provided evidence.
Relevant chemistry
The provided evidence identifies it as a hard-surface cleaner but does not establish pH or specific chemistry classes.
Source: official product page ↗