Oh I LOVE new puppy smell! 😍
I would hazard a guess that this is paranoia due to your family’s views. I say this because my husband comes from a family who have no pets and who have always made comments about homes with dogs being ‘smelly and unclean’ (which upset me greatly as I come from a family with A LOT of dogs). When we got our first puppy, my husband felt as you do now, although not as extreme. It soon wore off and we have never had less than 2 dogs in the house over the 20 years since our first.
You need to stop worrying about what your family will think, if you love the pup and they want to visit, they’ll just have to get used to it. Although it’s highly unlikely your house actually smells, well, not as much as you think it does anyway.
But to my first point, if you’re associating dogs with being unclean, you will always be paranoid about something to do with him, so it may well be best to take him back if you feel you can’t get past this feeling. Think of how many homes, from Buckingham palace to the smallest flats, have dogs - they can’t all be dirty and smelly.
Ps. As someone has spent their entire life surrounded by many, many Spaniels, they are definitely not a ‘smellier breed’.
Pps. Stop washing the puppy, it’s really not great for their skin and coat to be over washed.