Its best with these ones to just accept not all people are going to see how it works. As I have said many times in the past, its a game of percentages.
Its a bit more dangerous at this time of year because more people are at home this week because the kids are off.
I had one like this a couple of years back, I had been cleaning her for about a year but she had always been out. First time I cleaned them when she was at home she got the hump.