Going back to 1940 for a moment, I found out how to get continuous action in feminine hygiene. ZONITORS! As best as I can tell, this stuff hung around in one from or another until at least the late 50s. Overall, the 40s seemed like an interesting and experimental time in feminine hygiene. From Lysol feminine hygiene (yes, it existed!) to this, all sorts of methods were tried. To quote from the ad- these dainty, snow-white suppositories spread a greaseless, protective coating... Non-caustic, contain no poison. Poison. POISON! Poison was a problem in feminine hygiene? AH! Yeah, just hand me those new Tampax, would ya? BTW, when was the last time anyone used the word caustic. Epecially "down there"?