[2026 Rainy Season Trends] 'Preventive Cleaning' Gains Traction: Demand for Air Conditioner and Bathroom Cleaning Rises Amid Mold and Odor Concerns | Osouji Kakumei

The rainy season is a time when high humidity and rising temperatures promote the growth of mold and bacteria. Concerns about mold, slime, and odors tend to increase, especially in places where moisture collects, such as bathrooms, washrooms, air conditioner interiors, and ventilation equipment.

At the comprehensive cleaning brand 'Osouji Kakumei' (operated by KIREI produce Co., Ltd., Representative: Tomoaki Fukui), which offers a wide range of services for homes, stores, and facilities, inquiries regarding water area cleaning, mold prevention, and ventilation equipment have been rising around the start of the rainy season every year. This year, demand for early countermeasures is growing.

Conditions Ideal for Mold Growth
Mold thrives in high humidity and prefers warm temperatures between 20-30°C. The rainy season, with its persistent humidity, warm days, and moisture trapped indoors, facilitates the growth of mold and bacteria in homes, stores, and facilities.

Areas particularly susceptible to moisture and dirt accumulation—and thus higher cleaning demand—include:
- Bathrooms and washrooms
- Air conditioner interiors
- Ventilation fans and ducts
- Commercial backyards
- Vacant rental properties
- Facilities in lodging and welfare sectors

Increasing Inquiries from Commercial Clients
In addition to individual households, Osouji Kakumei is receiving more consultations on hygiene measures from restaurants, offices, lodging facilities, and rental management companies. Common concerns include mold odors in bathrooms, poor ventilation, unpleasant smells from air conditioners, and the need to reset water areas before new tenants arrive.

Popular Cleaning Services
■ Bathroom Cleaning & Apron Interior Wash
The interior of the bathtub side cover, or 'apron,' is highly prone to humidity, mold, slime, and sebum accumulation. As it is an invisible area, more customers are requesting thorough cleaning before the rainy season.

■ Anti-Mold Antibacterial Coating
A popular option to prolong the clean state after washing. Demand is high for hygiene protection not only in residential water areas but also in managed properties and lodging facilities.

■ Ventilation Fan & Equipment Cleaning
Reduced ventilation efficiency traps moisture, leading to mold and odors. For stores and offices, this is a peak period for consultations regarding air environment deterioration due to dirty ventilation systems.

■ Air Conditioner Cleaning
Air conditioner interiors, which see increased use from the rainy season through summer, tend to accumulate mold and dust. Demand for early cleaning is rising in households, restaurants, and facilities to combat odors and hygiene issues.

Preventive Cleaning Before the Rainy Season Peaks
It is more important to prevent mold and odors through prior cleaning and ventilation than to deal with them after they occur. Osouji Kakumei supports hygiene management for homes, stores, and facilities. We recommend early cleaning before moisture and mold issues become severe.

In the 2026 rainy season, needs are shifting from 'cleaning to remove mold' to 'preventive cleaning to stop mold from occurring.' Countermeasures for air conditioners, bathrooms, and water facilities before the peak rainy season are the key to creating a comfortable living environment.