Amazon calculates a product's star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
Bought almost a dozen of these. Good for spraying shoes, sandals, slippers, while leaving them outdoor. Also used to spray bills and coins (money), if in case we can't use tap or cards. Can also be used for spraying car seats or public transport seats. Better safe, than sorry.