Soft washing conservitory roofs/ car ports? would it cause damage?

[mr shine]

i dont know how long the pump on a trolley would last pumping hypo , maybe a knacpsack sprayer would be a better option , im using one for the last few years and once it well rinsed after use its no problem

 

[Smurf]

Many have tried using hypo in a so say chemical backpack sprayer. Hypo kills them in no time at all.