Acid Cleaner for Cement, Grout and Limescale Residue – Kerakoll Delta Plus

A professional water-based acid cleaner from Italy’s Kerakoll, designed to remove residues of cement, lime, cementitious grout, salts and limescale deposits. Suitable for cleaning ceramic tiles, porcelain tiles and other acid-resistant surfaces. It can be diluted with water according to the type of dirt and the sensitivity of the surface.

Supplied in a 1 kg pack.

Detailed description

Key Advantages

  • Cleans cement and grout residue: removes mineral residues left after tiling and cladding work.
  • Removes limescale and salts: helps clean mineral deposits from suitable surfaces.
  • Controlled cleaning action: suitable for cleaning mineral grout after full curing.
  • Flexible dilution: can be diluted with water at any ratio, according to the surface type and the level of dirt.
  • Suitable for a range of surfaces: suitable for dense and porous acid-resistant materials.
  • For indoor and outdoor use: suitable for cleaning floors and walls.
  • Made in Italy.

Product Description

Intended for professional cleaning after tiling and cladding work and for maintaining acid-resistant surfaces, while allowing the cleaning strength to be flexibly matched to the needs of the job.

The product works through a controlled acid action, which helps break down mineral deposits and remove cementitious adhesive and grout residues left on the surface after installation work.

It can be used on ceramic and porcelain tiles, glass mosaic, terracotta (Cotto), clay bricks, concrete, cementitious render and hardened cementitious grout, provided the surface is acid-resistant.

The option of diluting the product with water makes it possible to match its concentration to the level of dirt and the resistance of the surface, and to use it both on dense surfaces and on suitable porous surfaces.

Technical Data

Property Value
Acidity level (pH) approx. 1
Dilution ratio can be diluted with water at any ratio
Estimated consumption 0.1–0.3 kg per m²
Application temperature 5°C to 35°C
Waiting time before rinsing approx. 5–15 minutes
Pack 1 kg
Shelf life approx. 12 months in the original sealed packaging

Instructions for Use

1. Surface preparation

Make sure the surface is free of dust and loose particles. Concrete, render and cementitious grout must be fully cured.

On highly absorbent surfaces, such as terracotta, clay bricks and concrete, it is recommended to wet the surface with water to saturation before starting to clean.

2. Preparing the product

Shake the container well before use.

The product can be used as supplied, or diluted with water according to the level of dirt and the surface’s resistance to acids.

3. Application and cleaning

Spread the product evenly over the surface and wait until the dirt begins to loosen.

Then scrub using a suitable brush or mechanical cleaning equipment. On large areas, a cleaning machine with a suitable abrasive pad can be used.

For stubborn dirt, the process can be repeated.

4. Thorough rinsing

After cleaning, rinse the surface thoroughly with water and dry it, to prevent acid residues remaining that could damage the surface.

Usage Limitations and Safety Instructions

  • Do not use on marble, natural stone, limestone or calcium-based materials.
  • Do not use on cement-based floor tiles, wood or surfaces that are not acid-resistant.
  • Do not use on glazes, metals or chrome-plated surfaces that are not acid-resistant.
  • Carry out a preliminary test on a small, hidden area before use.
  • Wait at least 7 days before cleaning standard cementitious grout, and at least 3 days for fast-setting cementitious grout.
  • Protect doors, windows, rubber seals, furniture and sensitive surfaces from contact with the product or its vapours.
  • Suitable gloves, protective goggles and respiratory protection must be used in accordance with the safety instructions.
  • Ensure ventilation during and after use.
  • Protect the product from freezing, direct sunlight and heat sources.

Good to know: this is an acid cleaner with a corrosive action. Follow the manufacturer’s instructions and the safety data sheet before use.

Technical Datasheet – File

Delta Plus technical datasheet

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