a student is participating in the school science fair. she wants to investigate household cleaners. which…

a student is participating in the school science fair. she wants to investigate household cleaners. which question can she best answer through scientific investigation?\nwhich household cleaner is most effective at removing stains?\nwhich household cleaner smells the best?\nhow often should a person use household cleaners?\nwhere should a person buy household cleaners?
Answer
Brief Explanations:
Effectiveness at stain - removal can be objectively tested and measured through scientific methods like using the same type and amount of stain on similar surfaces and applying different cleaners to see which one works best. Smell preference is subjective, frequency of use depends on personal habits and surface conditions, and where to buy is a matter of availability and personal choice, none of which are as scientifically testable as stain - removal effectiveness.
Answer:
Which household cleaner is most effective at removing stains?