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It's possible people who stayed in the hotel room before BM got to it used bleach (maybe each day they stayed there) to wipe things down (because COVID). Bleach fumes can last a while, depending on amount used and accumulated, room ventilation, etc.
Cleaning crew in the hotel wouldn't necessarily know which surfaces (I wouldn't put it past fearful guests to have used it on bed and/or chair surfaces, door knobs, vanity and counter tops, sinks, drawer handles) to clean nor necessarily have products to neutralize bleach aroma.
How Long Does Bleach Fumes Last in the Air?
Again... just throwing it out there.