House training
How do I clean dog urine out of tile grout?
Last updated 23 September 2026 · How we write and check this
Short answer
Grout is porous, so urine can soak below the glazed tile surface even when the tile itself wipes clean easily, leaving enough residue in the grout lines for a dog to detect and return to. A paste of baking soda and a pet safe enzymatic cleaner worked into the lines with an old toothbrush, left for 15 to 20 minutes, clears it far more thoroughly than a standard mop.
Why tile can look clean while grout still smells
The glazed tile surface sheds liquid easily, but the rougher, more porous grout between tiles absorbs it, similar to how carpet padding traps moisture beneath a spot that looks perfectly clean once wiped.
A more thorough grout cleaning method
Mix baking soda with a small amount of pet safe enzymatic cleaner into a paste, scrub it into the affected grout lines with an old toothbrush, leave it to sit for 15 to 20 minutes, then rinse thoroughly, repeating the process for a stubborn or repeat use spot.
Preventing the same grout line from becoming a repeat target
Once the spot is genuinely clean, applying a grout sealant, widely available and safe for pets once fully cured, makes the surface less porous going forward, reducing how easily a future accident could soak in and linger.
Key takeaways
- Grout's porous texture traps urine residue even when the surrounding tile wipes visibly clean.
- A baking soda and enzymatic cleaner paste, left to sit for 15 to 20 minutes, treats grout more thoroughly than mopping.
- Sealing the grout afterward reduces how easily a future accident could soak in and become a repeat spot.