Chlor-Cling is a non hazardous addtivie that is designed to crease the foam generated with your bleach cleaning solution.
A thicker foam will aid ine xtending the contact time of 12.5% sodium hypochlorite to cling to roofs, walls, etc.
Chlor-Cling also contains an extra penetrating surfactant to accelerate a more effective and advanced bleach cleaning.