Shower glass is not explicitly listed, and the product's exact formulation and pH are unspecified. Residue or spotting is possible if not rinsed thoroughly.
Why
This is a rinse-off surfactant cleaner intended for grease and grime, and ordinary uncoated glass is generally compatible with such products. However, Dawn warns against coated surfaces, which may include some treated shower glass.
What to do
Use on ordinary uncoated glass, rinse thoroughly, and dry. For coated, tinted, or water-repellent-treated glass, spot-test first or use the coating manufacturer's cleaner.
pH
Not stated
Relevant chemistry
Spray-activated suds with cleaning boosters; grease and food-residue cleaner. Exact formulation and pH not stated.
Source: official product page ↗