How to Clear Windows Cache in Windows 10: A Complete Guide

Clearing your Windows cache is one of the most effective ways to free up disk space, resolve sluggish performance, and fix odd software behavior — without uninstalling anything or making permanent changes to your system. But "cache" in Windows 10 isn't a single thing. It's a family of temporary storage types, each serving a different purpose and requiring its own clearing method.

What Is Windows Cache and Why Does It Build Up?

Your PC stores cached data to speed things up. When Windows or an app fetches something repeatedly — a thumbnail, a webpage, a font file — it saves a local copy so it doesn't have to re-fetch it every time. That logic is sound. The problem is that these caches grow continuously and are rarely cleaned automatically.

Over time, accumulated cache can:

• Slow down file browsing and app loading
• Cause outdated thumbnails or corrupted display elements
• Consume gigabytes of disk space on drives that are already tight
• Occasionally cause software glitches when cached data goes stale

Windows 10 holds several distinct cache types: temporary files, DNS cache, thumbnail cache, Windows Update cache, Prefetch data, and browser cache (which lives inside each browser, not Windows itself).

The Main Types of Cache in Windows 10

How to Clear Temporary Files 🗂️

This is the most impactful starting point for most users.

Using Storage Sense (built-in, easiest method):

1. Open Settings → System → Storage
2. Click Temporary files
3. Windows will scan and list what's safe to delete — downloaded program files, thumbnails, Recycle Bin contents, and more
4. Check what you want removed, then click Remove files

Using Disk Cleanup (traditional method):

1. Search for Disk Cleanup in the Start menu
2. Select your drive (usually C:)
3. Review the list of file categories and check those you want cleared
4. For deeper cleaning, click Clean up system files — this adds Windows Update cache to the list

Both methods are non-destructive. They do not touch your personal files, installed programs, or system settings.

How to Clear the Thumbnail Cache

When File Explorer shows outdated or broken preview images, the thumbnail cache is usually the culprit.

1. Open Disk Cleanup (search via Start menu)
2. In the file list, locate and check Thumbnails
3. Click OK to delete

Windows will rebuild thumbnails automatically the next time you browse affected folders. This process is temporary — thumbnails accumulate again over weeks of normal use.

How to Flush the DNS Cache

The DNS cache stores recent lookups that map website names to IP addresses. Flushing it is useful when a website isn't loading correctly or you're experiencing connection issues after a network change.

1. Search for Command Prompt, right-click, and select Run as administrator
2. Type: ipconfig /flushdns
3. Press Enter

You'll see a confirmation message. This takes seconds and has no negative effect on your browsing — your PC simply performs fresh DNS lookups on next use.

How to Clear Windows Update Cache

Downloaded update files can linger long after installation. They're generally safe to remove once updates are confirmed complete.

1. Press Windows + R, type services.msc, and press Enter
2. Find Windows Update in the list, right-click it, and select Stop
3. Open File Explorer and navigate to: C:WindowsSoftwareDistributionDownload
4. Select all files in this folder and delete them
5. Return to Services, right-click Windows Update, and select Start

Note: Do not delete the SoftwareDistribution folder itself — only the contents of the Download subfolder.

How to Clear Prefetch Data

Prefetch files help Windows launch frequently used apps faster. Clearing them won't harm your system, but Windows will spend slightly longer loading those apps on first run afterward as it rebuilds the data.

1. Press Windows + R, type prefetch, and press Enter
2. If prompted by a permissions dialog, confirm access
3. Select all files (Ctrl+A) and delete them

This is a lower-priority task for most users. The performance benefit of clearing Prefetch is minor compared to clearing temp files or Windows Update cache.

Factors That Affect How Much Cache You're Dealing With

The practical impact of cache clearing varies significantly depending on your setup:

• Drive size and type: On an SSD with limited storage, clearing even a few gigabytes matters. On a large HDD, the urgency is lower.
• How long since last cleanup: A machine running for years without cleanup accumulates far more than one that's freshly set up.
• Update frequency: Systems that receive regular large Windows updates build up more update cache.
• Browsing and app usage: Heavy app users and frequent file browsers generate more temp and thumbnail data.
• Technical comfort level: Some of these steps (especially the SoftwareDistribution folder) require a bit more care than others.

A Note on Third-Party Cleaning Tools

Various third-party utilities automate all of the above in a single click. They vary considerably in how aggressively they clean, what permissions they require, and how reliably they distinguish between safe-to-delete cache and files Windows actually needs. The built-in methods described above cover the most meaningful cache types without those tradeoffs — but how much automation you want, and how often you want to run it, depends on your own tolerance for manual maintenance versus your comfort with third-party software running at system level. 🖥️

That balance — between convenience, control, and risk — is something only your specific setup and habits can answer.