Mould around windows forms due to dirt, dust, and debris accumulation that blocks airflow, creating an ideal growing surface. Caulking and sills are particularly susceptible. Mould requires moisture from temperature fluctuations between indoors and outdoors, excess humidity, or nearby leaks. Once established, mould eats away at the caulking and can permanently stain it.

Begin by checking for leaks around the window frame and assessing whether insulation is adequate. Evaluate room ventilation and consider improving exhaust fans or ducting. For mild cases, independent cleaning may be appropriate. Severe cases require professional intervention due to health risks from spore release, particularly for those with respiratory conditions. A mould inspection can confirm the severity.

Regular cleaning of windows, sills, trim, and tracks is the most effective preventive measure. Address condensation through improved airflow using fans or dehumidifiers, especially during cold months. Ensure windows are properly sealed and insulated - persistent condensation may indicate a need for professional window re-sealing or replacement.

Mild mould cases respond well to detergent or diluted bleach solutions applied with rags, spray bottles, and soft-bristle brushes. Use Q-tips for tight areas in tracks and corners. Severe cases require air purification, containment of the affected zone, respirators, and full personal protective equipment - these situations are best handled by trained professionals. Contact us for a free assessment.