- Proprietary Organic Acid (pH ~1.0) – Twice as effective at dissolving calcium carbonate as phosphoric acid, yet a mild skin irritant—safer than muriatic acid
- Ready-to-Use or Dilutable – Use RTU for heavy-duty jobs or dilute 1:1 with hot water for general restoration
- Restores Grout – Penetrates and removes embedded soils, hard water spots, efflorescence, and soap scum to revitalize grout in older or neglected areas
- Safer Acid Alternative – Milder on skin compared to strong acids but still effective—recommended when other cleaners have failed
- Surface Caution – Can etch marble, limestone, metal, or unsealed surfaces; pretesting and masking advised
- Mandatory Neutralization – Must be followed by alkaline cleaner (e.g., Viper Venom II, diluted 1:32) and rinsed thoroughly to preserve grout integrity
- Clear, Acrid Liquid – RTU pH of 1.0; sold in 1-gallon jugs (3.79 L)
Esteam Viper Renew Tile & Grout Acidic Cleaner – 1 Gal
$68.50
Viper Renew is used when all other cleaners have failed, and is a safer alternative than aggressive acids like phosphoric and muratic. The proprietary organic acid is twice as effective in dissolving calcium carbonate than phosphoric acid, yet is classified as only a mild skin irritant. Viper Renew will readily remove the embedded soil layer thereby renewing the surface of the grout.
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