I lean out the window as well, but my window is concealed which helpsPersonally the shower thing never worked for me. But I'll try it together with the paper roll, might work
I use this pipe at home:
I lean out of the window when I smoke, and the room basically doesn't smell at all. It's good shyt and cheap, google "monkey bar"
here is the thing I'm talking about.. it filters the smoke thru the dryer sheets, i didn't explain it very well