Vet-recommended enzyme treatment for Himalayan cat

A vet recommending a full room enzyme treatment usually means there's accumulated cat urine throughout the space — often more than the owner can smell, but enough that the cat keeps marking the same areas. The only products that permanently eliminate pet odours are enzyme-based cleaners — anything else just masks the smell, which means your Himalayan will keep returning to the same spots. To point you to the right product and approach: are we talking carpet, hard flooring, soft furnishings, or a mix of all three? And is this general territorial spraying, or has she been having accidents in specific spots?

That makes complete sense — once cat urine dries and crystalises in carpet fibres and sofa fabric, the odour compounds become almost indestructible without enzymes. The months-old staining is the priority because those dried crystals reactivate every time humidity rises, which is exactly what keeps drawing her back. Before I give you my recommendation: how large is the living room roughly, and is the sofa fabric or leather? That affects how much product you'll need and whether you can saturate the sofa safely.

Your vet is right — with set-in cat urine, UV light usually reveals far more than you can see or smell, so whole-room treatment is the correct approach. For this job I'd recommend Simple Solution Extreme Pet Stain and Odour Remover. It's a professional-strength enzyme formula specifically designed for heavy or set-in cat urine, and it comes in a 4-litre bottle which is what you need for a job this size — you'll likely use most of it. For the carpet, you need to saturate it thoroughly, not just dampen the surface, because the urine has soaked down into the backing and possibly the underlay. Leave it wet for 10 minutes, then blot — don't rub. For the sofa, do a small colourfast test on a hidden seam first, then apply generously to the affected cushions and leave to air dry completely. The vet's instinct to treat the whole room is sound: even areas you haven't identified will have trace amounts that your Himalayan can detect. One bottle should cover the living room carpet and sofa; grab a second for the bedroom.

Simple Solution Extreme is bio-enzymatic and non-toxic once dry — keep her out of treated rooms until the carpet and sofa are fully dry, which typically takes a few hours with good ventilation. Don't rush it with a hairdryer on carpet though, as heat can set any remaining odour compounds before the enzymes have finished working. Once everything is dry she's fine to go back in. One last tip: if you can get a UV black light torch cheaply, use it before you treat — it shows up every urine spot as a bright glow in the dark, so you don't miss anything the vet was referring to.

That's the right call. Two bottles of Simple Solution Extreme plus the UV torch and you have everything you need for a proper full-room treatment. Once the smell is completely gone, her urge to return to those spots should drop off significantly — especially since the underlying issue is already treated. Good luck with it.