Black streaks and patches on building façades come from fungus and mold.

The Department of Economics and Management Sciences of a University in Kuala Lumpur wanted to refresh the look of its buildings without investing in costly refurbishing work.

But to eliminate fungus without damaging the façade is not an easy task: trials using high pressure water jet and chlorine-based products all damaged the wall finishing.

Pacific Beam Mold (PBM) is the only method used that killed fungus and mold without causing any damage to the walls.

PBM in its powder, dispersion form, was mixed with water and sprayed on fungus patches with concentrations of 4% and 8%.

With a 4% concentration, fungus was removed after letting PBM work for a few hours then hosing down the wall with water.

Photos: PBM was mixed with water at 8% concentration then sprayed on a fungus infested wall, then left 15 minutes to work.

Dead fungus quickly started falling off in a dark powder form, the wall was sprayed with water to complete the cleaning process.

This concentration was proven to be the best at quickly and easily cleaning the building's facade.

Once fungus was eliminated from the building, PBM mixed at 2% concentration was sprayed on the walls to provide a long-term anti-mold and anti-fungus preventive protection.

A wall section darkened by fungus was chosen to conduct trials.

High pressure water jet proved desastrous and damaged the wall.

A solution with 60% chlorine caused discoloration of the wall's sand pasting.