Got a potential custy who wants outsides every month and insides every 3 months, but she has a concern over dirty water and mess ruining her new carpets, I have said I will go over options when I call round. Would you consider using the Vikan kit as video on Gardiner website seems to show it works or stick to advising trad is the only option. I don't know how dirty her windows are yet but it would be nice to offer her a couple of options. If I purchased the Vikan it would need to be good enough to offer to other customers as I don't see the point for just one customer. All advice greatly appreciated.