But police campaigns don't explicitly say: "Lock your doors and windows, or you'll be raped or murdered". There isn't that explict connection between risk of personal harm and lack of action as there is with handwashing campaigns. Even with lumps, yes there is the stuff about cancer, but the message isn't as clear cut as:
"Washing your hands properly removes dirt, viruses and bacteria to stop them spreading to other people and objects, which can spread illnesses such as food poisoning, flu or diarrhoea.
"Hands are easily contaminated with faecal bacteria [poo] when going to the toilet and this can be easily spread on to other things you touch, including food," says Professor Jeremy Hawker, a consultant epidemiologist at Public Health England."
The above is from the NHS website. It is unambigious and it comes from an authoritive source. It makes it clear that washing your hands removes something: the contaminant. Advice, for example, about checking for lumps is not as explicit. You don't get lump-checking advice that directly says: "Check for lumps to remove cancer".
There's also that sense of disgust I was talking about. A person without OCD is unlikely to feel a sense of disgust if they come across an unlocked car door or house window, but they would likely feel disgusted if someone with poo on their hands made a sandwich for them. So the feelings of revulsion and discomfort often conjured up by contamination-based OCD aren't entirely unjustified in that regard. That's why I think contamination-based OCD is different to other OCDs.
Just my thoughts anyway. It's fine if you and others disagree.