Chrome can already clear browsing data, but it takes several clicks and clears everything at once. A cache cleaner extension puts that job on the toolbar, remembers your preferred settings and can target a single website, which matters when you only want to reset one site you are testing or troubleshooting.
What a cache cleaner extension clears
Most cache cleaner extensions can remove the cached images and files Chrome stores to load pages faster, plus cookies, local storage, form data, downloads history and browsing history. The better ones let you pick each data type and a time range, so you can clear cached files from the last hour without logging yourself out of every website.
Clear the cache for one site only
If a single page shows an old version or keeps failing to load, you rarely need to wipe everything. Look for an extension that can clear data for the current tab's domain only. It fixes the stuck site while keeping your logins and preferences on every other website intact, which saves time for developers and support teams.
When you don't need an extension
For an occasional clean, Chrome's built-in option is enough: open More tools, then Clear browsing data, pick a time range and the data types. An extension earns its place when you clear data several times a day, need one-click resets while testing websites, or want per-site control without opening settings.