Quick Answer
Terracotta, travertine, and slate are all porous natural materials that need a pH-neutral cleaner, a damp (not wet) mop, and thorough drying to avoid water damage. Standard glazed bathroom tiles are far more forgiving and tolerate most household cleaners. Never use vinegar, lemon, or other acidic cleaners on natural stone, since they etch and permanently dull the surface.
Why Natural Stone Tiles Need Different Treatment
Terracotta, travertine, and slate are all natural, porous materials, unlike manufactured ceramic or porcelain bathroom tiles. Their pores can absorb water, soap residue, and acidic cleaners, leading to staining, etching, or sealant damage if the wrong products are used. Checking whether your tile is sealed, and with what finish, before cleaning helps you choose a safe method.
How to Clean Terracotta Tiles
Sweep or vacuum first to remove loose grit, which can scratch the surface if dragged around with a wet mop. Fill one bucket with a diluted pH-neutral cleaner and a second with clean water. Mop in small sections using the cleaning solution, wringing the mop out until barely damp, then rinse with the second bucket to avoid spreading dirty water. Dry the floor afterward rather than letting it air dry, since standing moisture is the most common cause of terracotta damage.
How to Clean Travertine Tiles
Use a soft-bristled broom or a vacuum without a beater bar to avoid scratching the surface. Mix warm water with a commercial stone-safe cleaner, never a harsh or acidic product, and mop with a well-wrung, barely damp mop. Weekly cleaning is generally recommended, more often in heavily used areas like a travertine shower, and spills should be wiped up immediately to prevent staining before it sets in.
How to Clean Slate Tiles
Sweep slate daily where practical, particularly in the months after installation, since new slate can shed small flakes as it settles in, a normal process called spalling that stops on its own. Mop with a pH-neutral cleaner made for natural stone, avoiding anything containing lemon or vinegar. Rinse with clean water and either air dry or dry with a soft cloth.
How to Clean Standard Bathroom Tiles
Glazed ceramic or porcelain bathroom tiles are far more resistant to moisture and acidic cleaners than natural stone. A standard bathroom cleaner or a mix of warm water and mild detergent, applied with a sponge or soft brush, handles most everyday grime, soap scum, and light limescale without the careful pH considerations natural stone requires.
Cleaning Grout Lines
Grout attracts dust, spills, and soap scum regardless of tile type. A soft grout brush with a mild paste of baking soda and water, left to sit briefly before gentle scrubbing, lifts most grime safely. Avoid bleach on grout near natural stone, since it can damage both the grout and the surrounding tile.
Tackling Oil and Grease Stains
Porous tiles like terracotta are particularly prone to absorbing oil and grease stains in kitchens. Blot fresh spills immediately with a dry cloth rather than wiping, which can spread the stain. For a stain that has already dried in, a poultice made from an absorbent material mixed with a mild cleaning solution, left to sit over the stain, draws the oil back out of the pores.
What to Avoid on Natural Stone
- Vinegar, lemon juice, or any acidic cleaner, which etches and permanently dulls natural stone
- Abrasive scrubbing pads or stiff brushes, which can scratch delicate polished or honed finishes
- Excess water left standing on the surface, which risks water damage on unsealed or poorly sealed stone
- Generic all-purpose cleaners not specifically labelled safe for natural stone
Sealing and Long-Term Care
Terracotta, travertine, and slate all benefit from periodic resealing, typically annually for slate and terracotta, to maintain water repellence and stain resistance. A quick water-drop test, seeing whether water beads on the surface or soaks in, indicates whether resealing is due.
Cleaning Frequency
| Tile Type | Recommended Frequency |
|---|---|
| Terracotta | Sweep daily, damp mop weekly |
| Travertine | Weekly, every 2-3 days in heavy use areas |
| Slate | Sweep daily, mop weekly |
| Standard bathroom tiles | Weekly, or as needed |
When to Call a Professional
Deep discolouration, mould that will not lift, or etch marks that persist despite gentle cleaning are signs it is time to bring in a professional. Natural stone specialists have access to tailored products and equipment that can restore a floor without risking further damage from an overly aggressive DIY attempt.
Frequently Asked Questions
Can I use vinegar on terracotta or travertine tiles?
No, vinegar and other acidic cleaners etch and permanently dull natural stone surfaces.
Why does my new slate floor shed small flakes?
This is called spalling, a normal settling process in the months after installation that generally stops on its own.
How often should natural stone tiles be resealed?
Typically annually, though a water-drop test showing water soaking in rather than beading is a reliable sign resealing is due.
Is bleach safe on bathroom grout near natural stone?
No, bleach can damage both the grout and surrounding natural stone tiles; a baking soda paste is a safer choice.
What is the biggest mistake people make cleaning natural stone tiles?
Leaving the mop too wet, since excess standing moisture is the most common cause of staining and sealant damage.