2. Clear the Air bags work. Hints of Ratso in study and bathroom vanish when I put a bag in the study. Vents are still blocked there but nothing seeps through anymore. Kitchen stink stops, mostly because I had a bag on the kitchen vent all yesterday.
3. Can run the heat without *too* much blowback in the rest of the house, and did this evening for an hour or so. It's not a smell that anyone but me would notice, and no, I'm not paying another $100 for three more bags when the smell will dissipate naturally, as it did with Rat #1. So at least I won't freeze in the coming cold.