ProductReview caches Amazon data in its own tables so pages stay fast. A few maintenance tools live under Product Review → Support.
Garbage collection
Old, unused product records are cleaned up automatically on a schedule (garbage collection). You normally never touch this — it keeps the cache tables lean.
Clear the cache
To force fresh data, use “Remove all data from cache” on the Support screen. The next page load re-fetches from Amazon (mind your API limits if you have many products).
Rebuild or reset tables
The Support screen can recreate the plugin’s database tables or reset settings to default. These actions aren’t reversible — only use them if support asks you to, and back up first.