I searched around and couldnt find anyone else doing this so here goes...
I have horrible allergies so i always have nasal sprayers on hand. Out of curiosity i grabbed an unopened one that had expired, cleaned the heck out of it, sanitized it and filled it with Starsan.
Works like a charm. Instead of spraying a ton of sanitizer in, it sprays a fine mist, coating the inside of the entire bottle.
To test it i used a 1 Liter PET bottle. Made sure there were no spots and it was clean as a whistle. 1 spray and it was coated. 2 sprays and it was dripping down the walls of the bottle. 3rd spray is for the clean-freak in me.
I couldnt find any missed spots even in the bottom of the bottle which, when inverted, is a good 9 to 10 inches from the nozzle. 1 spray and a 12oz is more than coated.
Another twenty bucks saved. I checked around at pharmacy and department stores and you can get el'cheapo nasal sprayers for about a buck.