Short answer
- Bleach can kill surface mold on hard, non-porous surfaces like tile or glass.
- It’s a poor choice for drywall, wood, and other porous materials — it can lighten stains without removing growth inside.
- The EPA does not generally recommend biocides like bleach for routine mold cleanup — removal and drying matter more.
- Never mix bleach with ammonia or other cleaners — it creates toxic gas.
What actually works
- Hard surfaces: detergent and water, scrub, then dry completely
- Porous materials with mold: usually removed and replaced
- Framing: cleaned, HEPA-vacuumed, and dried by professionals
- The moisture source: fixed — otherwise mold returns
Why “it looks gone” isn’t enough
Bleach removes color. A stain that disappears can still have growth in the material, and the water in bleach adds moisture. That’s why professional remediation focuses on removing affected material inside containment, not spraying it.
When to call a pro
For areas larger than about 10 square feet, mold after a leak or flood, or anyone in the home with health concerns. See remediation vs removal and when to call a pro.
Mold that won’t stay gone?
Call (385) 250-2825 — answered live 24/7 by the Vault crew.
Mold remediation services · Black mold — what to do · Preventing mold
Need help with mold in Provo? Our Provo mold remediation crew is AMRT-certified, and remediation jobs start at $500. Call (385) 250-2825.