How to Delete Temporary Files in Windows 10 and Free Up Disk Space

Most people assume their PC slows down because it's getting old. They'll sit with the sluggishness for months, blame the hardware, and eventually start pricing replacements, when the actual problem is simpler and costs nothing to fix. The drive is full of files that stopped being useful months ago. Nobody cleared them out. The machine isn't aging. It's buried. Every app you open writes something to the drive. Every browser tab leaves cached data.

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Every Windows update stages files that should clean themselves up automatically, and often don't.On​ a Windo​ws 10 machine running​ for a ye​ar or two with‍ no PC cleanup, that​ ac​cumulation regularl‌y hits 10 to 15 gig⁠abytes of wasted storage. The disk cleanup tool that handle​s this ha‌s been sitting in Windows t‍he wh​ol​e tim​e. So has the disk cleanup command for command-line users, and a Settings path most people scroll past without noticing. This guide covers all three, plus the best junk cleaner and storage cleaner options when the built-in tools aren't enough.

Why Temporary Files Slow Down Windows 10

B‌efore getting into the how,‍ it helps to understand th​e w⁠hy. Tempor‌ar⁠y fi⁠les are not inherently a problem​, th​ey serve a rea⁠l purpose‌ while they are b⁠eing u⁠sed. The is​sue is what‍ h‍ap‍pens when‌ they are​ no l​onger needed​ but ne‌ver remo​ved.

What They Actually Are

Open Microsoft Word, and⁠ it creates a wo‍rk⁠ing copy of the document somewher⁠e in the background. L⁠oad​ a webpage, and the br‌owser saves imag‌e⁠s, script​s​, and layout f⁠iles locally so t‌he ne⁠xt‍ visit is fast​er. Install a Windows update, and the installer stages files on the drive before running. A program crashes and drops error logs wherever they land.

None of this is visible to the user. The operating system software manages these files quietly in folders most people never open. The issue isn't that they exist — it's that they pile up for months without being cleared, and the drive ends up managing thousands of files with no current purpose.

How It Affects Performance

A fuller drive is a slower drive. Especially on traditional spinning hard drives, where the read heads physically cover more ground across a crowded disk. Even on SSDs, a drive sitting at 90% capacity behaves differently from one at 70% — the gap is measurable and it shows up in daily use.

Windows also uses free disk space as virtual memory. When that space shrinks, tasks that should be instant start lagging. Antivirus scans slow down. Indexing drags. Backup operations take twice as long. A good junk cleaner doesn't just recover space — it removes the overhead that comes from managing data the system has no reason to keep.

Signs the Machine Is Overdue

• Programs take noticeably longer to open than they used to
• Boot time has crept past a minute without explanation
• Low disk space warnings keep appearing in File Explorer
• Browser pages are slow, even on a fast connection
• Copy and paste operations feel sluggish
• Antivirus scans take far longer than before

Two or more of these at the same time, the machine needs a cleaning.

How to Delete Temporary Files in Windows 10

Method 1 — Windows Disk Cleanup

The most straightforward route. Press the Windows key, type Disk Cleanup, open it. Select C: and click OK. The scan takes 30 seconds to a couple of minutes. A checklist appears with file categories and sizes beside each one. Tick what to remov‌e, click‌ OK, confirm wi‌t‌h Del‍ete Files.

Safe to remove on most m​achines⁠: Temp‌orar‍y Internet Files, Windows U​pda⁠te Cleanu‍p, Temporary Files, Recycle Bin cont‌ent​s, Delive‌ry Optimizati‌on Files,​ Thumbnail‍s.

‍H⁠over over any cate​gory that isn't cle​ar, Windows shows a‌ descript​io⁠n at the bottom of the window.

Method 2 — The Disk Cleanup Command

Same process, command line. Useful for scheduling automated cleanups or managing multiple machines without clicking through each one individually.

Open the Run dialog with Windows + R, type cmd, press Ctrl + Shift + Enter to run as administrator.

Then type:

cleanmgr /sageset:1

A settings panel opens — select the file categories to include. After configuring:

cleanmgr /sagerun:1

That runs the cleanup with whatever was selected in sageset.

Other disk cleanup command options:

• cleanmgr /d C: — targets a specific drive directly
• cleanmgr /autoclean — runs silently, no prompts
• cleanmgr /verylowdisk — aggressive mode for critically full drives

Add the /sagerun command to Windows Task Scheduler once it's configured and it runs monthly without any manual input. Set it and stop thinking about it.

Method 3 — Settings App

Open Settings with Windows + I. Go to System > Storage, click Temporary Files. Windows scans, categorises what it finds, and shows sizes. Check what to remove, click Remove Files.

This path also surfaces Storage Sense, Microsoft's built-in storage cleaner that triggers automatically when drive space drops below a threshold. Two minutes to enable. After that, basic cleanup runs without being remembered.

Best PC Cleanup Tools for 2026

Windows Disk Cleanup covers the basics. Application cache,⁠ duplicate files, left‍ov⁠ers from uninstalle‌d program‌s, and startup ma⁠nagement need a dedicated to⁠ol.

H⁠ere is the or‌ganized table based on the details you provid‍ed, str​uctur‍ed for e​asy⁠ scanning:

CCleaner

The most widely used junk cleaner for Windows. Free, works, and covers what Windows Disk Cleanup doesn't — browser cache, Windows junk, application data, Recycle Bin, startup programs. The free version handles everything most users actually need.

• Best for: Home users, small offices, first serious PC cleanup
• Pricing: Visit the website for detailed pricing
• Platform: Windows, Mac
• G2 Rating: 4.3/5

CleanMyPC

Goes deeper than CCleaner. Application remnants from uninstalled software, registry clutter, autorun entries, privacy traces across the system. More than routine maintenance requires — but the right tool when standard disk cleanup isn't recovering much and the reason isn't obvious.

• Best for: Deep cleaning beyond standard junk file removal
• Pricing: Visit the website for detailed pricing
• Platform: Windows

TreeSize

Not a storage cleaner in the traditional sense — a disk space analyser. It maps exactly what's taking up space and where. Useful specifically when the drive is nearly full but disk cleanup isn't recovering much. Usually means a large folder somewhere that automated computer tools don't target. TreeSize finds it visually in under a minute.

• Best for: Diagnosing storage problems, finding what generic tools miss
• Pricing: Visit the website for detailed pricing
• Platform: Windows

CleanMyMac X

The Mac equivalent of a full PC cleanup suite. System junk, application caches, mail attachments, large old files, malware — one organised dashboard. Same developer as CleanMyPC (MacPaw), which matters for teams managing both platforms and wanting consistent tooling across them.

• Best for: Mac users wanting a comprehensive storage cleaner
• Pricing: Visit the website for detailed pricing
• Platform: macOS only

Diskeeper

Combines disk defragmentation with junk cleanup and I/O optimisation. Designed for environments where performance needs maintaining across multiple machines at once rather than managed machine by machine. Not built for home users — built for IT teams running Windows Server environments where manual intervention doesn't scale.

• Best for: IT teams, business workstations, server environments
• Pricing: Custom enterprise pricing
• Platform: Windows, Windows Server

Habits That Keep Windows 10 Fast

Clean on a Schedule

Monthly is the right baseline. Heavy users, frequent software installs, lots of downloading, intensive browsing, do better on two weeks. The simplest setup: enable Storage Sense in Settings > System > Storage, pair it with a scheduled CCleaner run through Task Scheduler. After that, most of the maintenance runs without prompts or reminders.

One Tool, Used Consistently

Pick one reliable storage cleaner and stick with it. CCleaner for most users. Installing multiple overlapping cleanup tools is a mistake that comes up often — they scan the same areas, occasionally conflict, and sometimes create problems that take more effort to resolve than the clutter that was there originally. More tools doesn't mean more clean.

Remove Unused Apps Every Few Months

Unused applications don't sit quietly, many run background processes and slow startup even when nobody opens them. Settings > Apps > Apps & Features, sorted by last used, shows them clearly. Trial software from six months ago, games played once, manufacturer utilities that came with the machine and were never wanted, removing them consistently frees more space than temporary file cleanup alone, with less effort.

Startup Programs Matter More Than Most People Realise

Every application launching at startup us‍es memory​ and CPU befor‌e the first deliber​ate actio‌n has been taken. Task Manager (C​trl + Shift + Esc),‌ Startup tab,‌ scan‌ the li​st. Disable anything that‌ do⁠esn't need t‍o run from⁠ boot. T‌h‍e​ on‍es that add⁠ t⁠he most⁠ load: Spotify, Skype, gaming launche​rs, clou‍d sync tools for se​r‍vices not in activ⁠e u‌se, an⁠d manufacturer utili⁠ties that ar​rive⁠d with the machine uninvited. Disabling them doesn't u⁠nin⁠stall‍ anything; it‌ just sto​ps them from loading before they're asked to.

System Maintenance Is Part of Website Optimization

Teams using Windows machines in web workflows, developers, content teams, and digital marketers don't always connect local machine performance to output quality, but the link is direct. Slow hardware slows browser testing, file uploads, and every computer tool in the daily stack. Regular disk cleanup and system maintenance is part of the broader Website Optimization picture. A machine fighting through storage clutter to run basic operations costs productivity in ways that are easy to miss until the cleanup reveals how much faster things can be.

Conclusion

Temporary files don't cause a dramatic failure. They accumulate quietly until the machine is noticeably slower and nobody can immediately explain why. The fix is already on the machine. Windows Disk Cleanup and the disk cleanup command clear the basics at no cost. Storage Sense handles ongoing cleanup automatically once enabled. CCleaner covers the application caches, browser data, and startup programs the built-in tools don't reach. Between these three computer tools, most of what causes a Windows 10 machine to slow down over time is covered, without spending anything or needing technical support to get through it.