Put a touch of her perfume in it, or even better find out what cologne she like and that will kick up things when she get home

(hint old spice will not work). Or even better a natural perfume that will not hurt the tank, like citrus. The blue brand of window cleaners is basically vinegar, ammonia, and something to make is small good. boil some cinnamon stick in water, run it through a coffee filter to strain the stuff out and bam
@Sabellafella cinnamon spice aqua glass cleaner. your catch line "keeps the glass clean, and the the girl friend happy"