The evidence does not establish compatibility with marble, product pH, or relevant chemistry. Marble can be sensitive to unsuitable cleaners, especially if the finish or formulation is unknown.
Why
Windex Original is identified as a hard-surface cleaner, but the official evidence neither approves marble nor provides enough chemistry information to rule out realistic surface damage.
What to do
Use only if the product label specifically permits marble; otherwise choose a marble-safe cleaner. If testing, spot-test an inconspicuous area and follow the label.
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 ↗