I have to laugh as what do the yanks know anyhow apart from YEHAA!
Trust me when I say YEHAA is no good for tarmac surfaces. Oops!
Also when softwashing (spraying hypo about) why take the risks of damaging stuff when their are alternative safer products that could be used on render walls etc instead.
Only thing going for hypo is that is as cheap as chips, ready available localy and is fast acting for instant looking results. That is why it's the most popular choice for dare I say it softwashing cowboys.
After saying that I will be putting on me cowboy hat on again this week as have some patio's and a block paved driveways to clean amoungst other work booked in. Still I prefer not to be spraying hypo about as will be applying it from a bucket and brushing it in instead.... YEHAA!