Q. After cleaning there are still microscopic black dots present on surface – does this mean it hasn’t worked & mould is still present?
A: No not necessarily. It is quite normal for black dots to remain – all spores will have been treated & killed what is left over is the ‘dead plant’. You can over-coat. However, what some people do is to leave the Fungicidal Wash for 4-5 days before scrubbing to allow deeper penetration.