Does anyone have any experience of medium sized industrial unit cladding cleans? its simple white upvc plank effect but there's tons of it - around 150sq metres which is mediumly minging with algae. I know virosol and wfp will get it off but have no idea how long a job like that would take? whenever I've cleaned fascias and gutters its taken a fair while to get them to a good standard and often need to go on a ladder to detail bits and bobs so not sure how long something like this would take. - Any experience on the forum?