OP, hope all goes well with your husband's surgery.
And yes indeed, they do say the sense of smell is the strongest of all our senses for evoking memories.
As far a soap goes, it is Dove original white bar soap (that we still use to this day) that takes me back.
When I was growing up at home, we used Dial or Zest. But my grandparents used Dove. By the time I was old enough to remember much about them, they had retired to Florida, and we would go down to visit them each year. The minute you walked through their back door (which was opposite their bathroom) the scent hit you. It is a pleasant smell to me, and since we have it in our shower constantly, I don't think about it much, but every once in awhile, I get a whiff of it, and I'm transported back to the late 1960's and early 1970's, and I'm at my grandparents house.