The Zep Mold Stain and Mildew Stain Remover is a professional-strength, alkaline-based solution sold in a convenient two-gallon case. It is formulated with a high concentration of surfactants to support its "no-scrub" claims, making it an economical choice for large-scale cleaning projects in basements or outdoor areas. The formula combines sodium hypochlorite and sodium carbonate to achieve a high oxidation potential, lifting organic stains from surfaces with minimal mechanical effort.
Specifications show the product is housed in HDPE (High-Density Polyethylene) gallon jugs. While this plastic is chemically resistant, it can become brittle over time if exposed to high temperatures or concentrated bleach vapors. Practical observations suggest that users should inspect the bottle necks for stress cracking before use, especially if they have been stored in unventilated areas like a garage or outdoor shed. The weight of a full gallon can also make precise pouring difficult, often requiring a secondary container or a funnel for safer handling.
Because the pH level sits between 12.0 and 13.0, the solution can etch aluminum and cause pitting in natural stone if not rinsed away promptly. The formula also generates significant vapor pressure, which can cause the bottles to "bloat" if stored in warm environments. For those managing extensive remediation, this bulk sizing offers great value, provided the storage conditions are kept cool and ventilated.
For smaller jobs where a gallon jug is too cumbersome, a 32-ounce spray like Mold Armor Pro Brand offers similar professional results in a more manageable format.
You can find more bulk and concentrated cleaning solutions in our mildew and mold cleaners department.
