Have you thought that old people have a particular smell?. Its actually something that is being researched.
Key things to do first, are sanitization of the environment as older people are often not able to do the level of cleaning they once carried out such as
SAN-AIRtm products can be used to help in many of these situations
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Just imagine it.
You just got home from an amazing holiday.
Your relaxed, refreshed and when you walk back in through your door...
WHAM you get hit in the face with musty, horrible odours.