We did a Hannover Court property today; about 40 flats; all full of elderly types.
Some of the ground floor windows were annoying; families had been up to visit - like waving at their elderly relatives through the glass - and quite a few had stuck drawings their kids had done to the windows with sticky tape.
So I had to carefully remove them, clean all the glass, and then re-stick them (I used electrician;s tape from the van) back on the glass.
I'm not even sure if I got the right drawings on the right flats.