I've lived in many, many weed-unfriendly places (including supervised youth hostels), and before I could afford a vape, too. Never been caught from smell after I started these two:
1) THis concept of a sploof (had to put it in Urban Dictionary!)... it may well work - never heard of it and I imagine it would work well. But... dryer sheets are hardcore not very good for you. Don't be sucking on it. We always found a *damp* teatowel clears up *all* smell instantly. Wad it up neatly, blow smoke/vape through. ZERO smell. You can tell it's picking up more as you get these distinctive lip-shaped tarmarks where you blow it through. These get much darker much faster if the filter (teatowel) is damp. H2O is the secret ingredient. To us, and having never tried a sploof, a damp teatowel is the nuclear option. I and friends smoked up hardcore many times in my tiny room connected to my supervisor's via a two-foot vent and she was bitching at us to keep the noise down. Lovely story. Damp teatowel.
2) Even if you're not smoking next to a window, set up an ordinary pedestal fan to blow directly out (like, right in front of it like an exhaust fan). It seems so obvious and hokey you'd not bother, but experience has taught me this simple expedient is very effective in clearing those lingering odours your damp teatowel somehow missed. It's also very stealth - nobody sees a fan near a window and thinks 'hippies'.
An added extra point is always have some music going (like you wouldn't anyway!). We get so hung up on smell we forget weed smokers make distinctive noises. Bubbling with bongs, giggling, lighters clicking... it all adds up and non-smokers have some kinda radar the rest of us have beaten down with THC.
I've just ordered an iolite and a MFLB as I'm moving into a weed-unfriendly house in the next few days. Vapes, teatowels and fans for me!