You will be given a definition of a task first, then some input of the task.
In this task, you're given a review from Amazon's food products. Your task is to generate a short summary of the given review in the input. Note that you don't need to write a complete sentence as a summary.

This is a great price, but every time I've bought these through Amazon, the bottles frequently have dark... "stuff" on the threads of the bottle when you open it. I've never seen this when buying them from the local drugstore, so I worry that these are either old or maybe not authentic? Can't say for sure of course. They do have the desired effect, so I'm not complaining too much. It's kind of gross sometimes though.
Output:
Good price -- not clean...?