I don't, because I'M the victim.
MUAHAHAHA... There's no cure now, but DEATH itself!!!
By the way, it's really hard for me to spread Touhou since most part of where I schooled (Btw, school is a hunting ground if talking about 'spreading' something), there are too little numbers who even know what Anime is, but not Touhou. For now, only me and two of my best friends are Touhou-fans in that school, with them two being mediocre while me being a hardcore. But I AM sure whether there's somebody hiding in the Rumia's shadow out there.
Some
theoretically possible ways:
Making Touhou references all the time and let them take interest.
(For girls) Draw Chibi Touhou characters and make them fall for my 'trap'.
Or sell bookmarks of Touhou characters, drawn by my uncle. lol
(For those who play games as their daily lives) Give 'em a try of Lunatic mode PAWAH!
(For Bookworms) Tell them a story related to Touhou's timeline history. If they're carving for more, direct them to the Touhou Wiki.
(For someone who likes musics) Give 'em a taste of ZUN's albums and OST collections!
The best possible subject however is someone who thinks, watch, hear, and tell crazy and science-defying stuff 24/7. And my two best friends (now me), are some of those peoples with such brains. An example of what crazy stuff I think is the moon, the crescent moon, has a crescent-shaped smile that has another crescent moon within that crescent smile that smiles a crescent in which another crescent moon inside the crescent smile which had a crescent-shaped smile that has a brightly-coloured crescent moon that smiles a crescent with crescent teeth sticking out of it's crescent lips.