Pug stains on original stone flags — safe cleaner

Original stone flags in a listed building — that changes things, because you're balancing genuine odour elimination against not damaging an irreplaceable surface. The only products that permanently destroy pet odours are enzyme-based cleaners; anything else just masks the smell, and your Pug will keep returning to the same spot because dogs can detect it long after humans can't. Before I point you to the right one, can you tell me: what type of stain is it — urine, faeces, vomit — and is it fresh or has it had time to soak in?

Six months of repeat soiling in one spot — that's the classic pattern when the odour hasn't been fully broken down. Pugs are also notably stubborn about toilet habits, so getting rid of every trace of scent is non-negotiable here. A couple of quick questions about the stone itself: is it sealed or unsealed, and does the surface feel porous to the touch? That affects how much you need to dilute and how long you leave the cleaner to dwell.

That's exactly the right constraint to work within, and it's actually fine — enzyme cleaners don't etch, bleach, or strip. My recommendation is Simple Solution Extreme Pet Stain and Odour Remover. It's a pH-neutral, enzyme-based formula with no bleach, no ammonia, and no harsh solvents, so it's safe on porous natural stone. The enzymes literally digest the uric acid crystals that are binding to the stone — that's what's drawing her back. For set-in stains on porous surfaces, you need to apply it generously, cover the area with a damp cloth to stop it drying too fast, and leave it for at least 10–15 minutes before blotting. Don't scrub — on porous stone that just pushes it deeper. You may need two applications for the older deposits.

Yes — blot up any liquid residue first with paper towels if there's anything fresh sitting on top. For the set-in patches, a quick wipe with plain cold water and a cloth is enough to lift surface dust without driving anything deeper. Then apply the Simple Solution straight onto the stone — don't pre-wet heavily or you'll dilute the enzyme concentration before it has a chance to work. One last thing: once you've cleared the odour completely, keep her off that corner for a few days if you can. Pugs are creatures of habit, and breaking the location association while the scent is gone gives you the best chance of stopping the cycle.