What Is Latex Leaching on Polymer-Modified Grout?

By Josh Kaplan

Updated: November 14, 2026

Key Takeaways

• Excess moisture before the polymers come together can leave a white polymer residue on some polymer-modified grout.

• The Tile Council describes latex leaching as less common than efflorescence.

Latex leaching is a type of white residue that can form on polymer-modified grout. The Tile Council of North America says it can occur when the grout gets too much moisture before its polymers come together. The council describes it as less common than efflorescence.

How polymer reaches the surface

The Tile Council says too much water during mixing can bring polymer to the grout surface. The same thing can happen if the grout is cleaned too soon or with too much water. If the polymer is white, it can show when the excess water evaporates.

How efflorescence forms

The council describes efflorescence as a mineral residue. Water carries dissolved minerals to the grout surface and evaporates. Latex leaching comes from polymer in the grout.

Why the cause matters for cleaning

The Tile Council’s grout cleaning guidance says the treatment depends on what caused the residue. For residue from polymer migration, the council says a cleaner’s effectiveness can vary with the polymer used.

Illustrative photo: Brownish floor tiles by Samiknoov, CC0 1.0.

Published by Groutastic.