It is a waste...
Starsan will work for a while but when it breaks down it becomes yeast/bacteria food, this is why it is preferred for brewing. Yes there is a thread about people Starsaning baby bottles and breast pumps. I personally would not do this because if you have ever left ANYTHING plastic/vinyl in starsan it gets a film on it...
The worlds best, cheapest spray bottle sanitizer, window cleaner and household everything spray is:
50% tap water + 50% distilled white vinegar
The wife uses this for EVERYTHING. It cuts through the nastiest stuff and smells in seconds and costs pennies compared to starsan. It does counter tops, windows, bathroom tiles, cutting boards, I honestly can not think of something this is not sprayed on that it doesn't out preform expensive cleaners, this will even kill cat piss odor! (Cats hate the vinegar odor however.) ... just keep it away from your brewery stuff!