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I found my own answer.
Rubber skid matt in tub + vinegar to clean shower = horrid onion smell
Rubber(?) and vinegar do not mix.
Problem solved.

We had a sick cat and a urine problem. It was cleaned up
Well but when the humity is high and temp. is just right
We still get a wiff of it. If you have high humity this might
Be the problem.

We have an onion smell in our bathroom that we cannot figure it out.
Our house is professionally cleaned and lets say spotless.
We have used many produces and nothing works... we cannot tell
Where...