Reset the house.
Start over clean.

Hot water extraction with a documented process: alkaline pre-spray to release oils, high-pressure hot rinse with an acid rinse agent to neutralise, sub-surface enzyme treatment where there is biological contamination, and protector applied to neutralised fiber. The owner of Spiker is a self-described germaphobe, which is why the process is documented rather than improvised.

The difference between surface clean and properly clean is entirely in the process order: dry soil removal first, alkaline pre-spray with real dwell time, agitation into the base of the pile, hot high-pressure extraction, acid rinse to neutral pH, groomed pile, controlled drying, protector on neutralised fiber. Skipping any step leaves something behind.

A full reset is sequenced: UV inspection to map biological contamination, sub-surface enzyme flush where urine has reached the pad, hot water extraction with acid rinse on all carpet, upholstery and mattress treatment for body oils and allergen load, tile and grout restoration, then protector applied across the board and a maintenance schedule that keeps it there.

It can meaningfully reduce the allergen reservoir. Carpet, upholstery and mattresses hold dust mite allergen, pet dander and pollen, and extraction removes a substantial share of it. For someone reacting at night the mattress usually matters more than the carpet. Nobody should promise a cure, and we do not.

Yes, and the timing matters. Clean far enough ahead that the carpet is fully dry and fully off-gassed, use a process that finishes at neutral pH so no residue is left where an infant will spend time on the floor, and treat upholstery and mattresses in the same visit since those carry the heaviest body-oil load.

It is the single best time to do it. The house is empty, so every square foot is accessible with no furniture to work around, nothing has to be moved back onto damp carpet, and drying is unrestricted. It is also when a UV inspection is most useful — you find out what the previous occupants’ animals did before your furniture is on top of it.