File, as Dennis Norden would put it, under “whatever happened to…?”
When did shop fitters (or, as I always misread it, shop lifters) stop soaping up windows? It used to be a common sight on the high street, I’m sure. Moreover, does one use yer actual soap, or is there a particular shop fitters’ soap that covers with just the right level of opacity, and washes off like a dream?
Maybe the soap in question is that universal panacea, sugar soap, the use of which to clean walls is as alien as a faery charm to some of my more bewildered contemporaries. I swear I only know about it because the name appeals.