When polishing surfaces such as concrete, marble, or terrazzo, one of the most common—and costly—mistakes is failing to properly treat existing stains. At Marathon Diamond, we know that a good result depends not only on the tool, but also on proper surface preparation.

Grease, rust, or chemical residue can seriously compromise the final finish if not properly removed. That’s why we’re sharing effective techniques for treating them before you begin the polishing process.

The Importance of Proper Pre-Cleaning

Before polishing, it’s essential to ensure that the surface is completely clean. Polishing over stains not only affects the aesthetic result but can also cause technical problems:

Dirt spreading into deeper layers of the material

Reduced service life of the polishing discs

Uneven finishes or visible marks

Proper preparation is key to ensuring a uniform, long-lasting, and professional polish.

How to Remove Different Types of Stains

Each type of stain requires a specific treatment. Below, we detail the most effective solutions for each case:

Removing Grease and Oil

Grease or oil stains are very common on industrial or construction surfaces.

Recommendations:

Use a specific industrial degreaser

Alternatively, apply a mixture of hot water and mild soap

Scrub with a stiff-bristled brush to facilitate removal

Rinse thoroughly with plenty of water

Important: Never start polishing without first completely removing all residue.

Treating Rust Stains

Rust can penetrate porous surfaces, so it is essential to use the right products.

Recommendations:

Use products containing oxalic acid (provided the material allows it)

Use rust removers specifically designed for rust

Perform a test on a inconspicuous area first

This will help prevent damage or unwanted discoloration.

Removing Adhesive Residue

Adhesive residue can leave stubborn marks that affect the final finish.

Recommendations:

Apply solvents such as acetone

Use with caution to avoid damaging the surface

Completely remove any residue before continuing

Best practices before polishing

To ensure optimal results, follow these guidelines:

Always test on a small area first

Wait at least 24 hours to check for any reactions from the material

Verify that the surface is completely dry and free of residue

Use tools and products appropriate for each type of material

Preparation and precision: the foundation of a good polish

At Marathon Diamond, we believe that the best results begin long before the polishing process. Proper cleaning and surface preparation not only improve the finish but also optimize tool performance and extend their service life.If you’re looking for precision, performance, and reliability in every project, always start with a flawless foundation.