Why a shower area is not a bathroom
An end-of-trip shower is used in a short burst each morning by people in a hurry, and it stays wet for most of the day afterwards. That produces mineral deposit on screens, soap residue in trays, hair in drains and a persistent moisture load that ordinary amenity cleaning does not anticipate. The method needs a product suited to soap scum and a genuine effort at drying rather than a wipe and move on.
Ventilation is the hidden variable. Where extraction is undersized or the area has no natural airflow, surfaces will not dry between uses no matter how well they are cleaned, and mould appears on sealant and grout within weeks. That is a building issue rather than a cleaning one, and identifying it early stops the cleaning provider being asked to solve something with a mechanical cause.
