Removing a visible mark without addressing moisture can leave the underlying issue unresolved. Start by understanding the problem rather than choosing a stronger cleaner.
Describe what you can observe
Record where the issue appears, whether it returns, any known leak and the approximate affected area. Photographs can help a property professional assess next steps, but they do not establish what is happening inside a wall or floor.
Tell a proposed cleaner before booking. Do not surprise a general house cleaner with an undisclosed remediation job.
Use appropriate guidance
Health Canada’s moisture and mould guide addresses assessment, prevention and cleanup. It describes a small area as no more than three patches with a combined area of one square metre or less; multiple patches may still indicate a wider moisture problem.
Size is not the only consideration. Recurrence, affected materials and household circumstances matter too. Follow the guidance and obtain qualified help where further investigation is needed.
Separate responsibilities
Identify who will assess moisture, repair leaks, deal with affected materials and perform any appropriate final cleaning. A routine cleaning quote should not imply that all these functions are included.
In a rental or managed building, report the issue through the appropriate property channel. Keep the report specific and retain the response.
Questions before work
- What is included in the proposed scope?
- Has the moisture source been addressed?
- Is this surface cleaning, repair or remediation?
- Who assesses the affected materials?
- What follow-up is needed if the issue returns?
Our household calculator is not a remediation quote. Obtain a scope-specific assessment. For routine work after the issue is resolved, see the bathroom checklist.