How to Clean Windows and Remove Junk Files With One Script

🧹 Clean Windows With One Script

If your computer is slow, freezing or taking ages to open things, part of the problem is often digital junk: temporary files left behind by installers, updates, browsers and programs that never clean up after themselves. Over months, that can add up to several gigabytes.

In this guide you’ll create a small script that removes that junk in seconds, schedule it to run by itself every week — and, if you want, turn this knowledge into a maintenance service for other people.

⚠️ Create a Restore Point

Before running any maintenance script on Windows, I recommend a professional habit: create a system restore point. It lets you roll back Windows settings if anything unexpected happens.

1. Press Windows + R
2. Type: SystemPropertiesProtection
3. Select the Windows drive (usually C:)
4. Click Create
5. Give it a name such as: Before_Windows_cleanup
6. Wait for it to finish

This habit is what separates an amateur from a professional: any script can, in theory, interact in an unexpected way with a specific setup (custom drivers, group policies, manually changed permissions). The restore point is your free safety net — it takes under two minutes and can save hours of headaches.

🧹 Cleaning in Practice

Here is the script. Open Notepad, paste the code, save it as limpeza.bat (in “Save as type”, choose “All files”) and run it as administrator:

@echo off
echo Cleaning temporary files...
del /s /f /q %temp%\*
del /s /f /q C:\Windows\Temp\*
cleanmgr /sagerun:1
echo Done!
pause

Some files will show “access denied” or “in use” while the script runs. That’s normal: they belong to programs that are open right now, and Windows protects them. The script simply skips them and moves on.

⚙️ Configure the Disk Cleanup Profile Once

The line cleanmgr /sagerun:1 runs Disk Cleanup using a saved profile number 1. But that profile has to exist first — otherwise Disk Cleanup has nothing selected to clean. Create it once:

1. Open the Start menu, type cmd, right-click it and choose Run as administrator.
2. Type cleanmgr /sageset:1 and press Enter.
3. In the window that opens, tick what you want cleaned (Temporary files, Delivery Optimization files, Recycle Bin, Windows Update Cleanup…).
4. Click OK. From now on, /sagerun:1 always uses these choices.

🔍 What Each Line of the Script Does

Understanding each line matters twice over: you can trust what’s running on your machine, and you can explain it to a customer if you decide to offer this as a service.

🔥 Automation

Most people stop here: they run the script once, feel the improvement and forget it exists. Months later the junk is back. Automating solves that at the root:

1. Open Task Scheduler from the Start menu
2. Click Create Task (not “Basic Task”)
3. On the General tab, tick Run with highest privileges
4. On the Triggers tab, choose Weekly — for example Monday morning
5. On the Actions tab, choose “Start a program” and point it to limpeza.bat

For the scheduled version, remove the pause line from a copy of the script — otherwise the window will sit there waiting for a key press that never comes.

💰 Turning It Into Income

This isn’t just a script — it’s the core of a service. You can offer cleaning, optimisation, monthly maintenance and remote support. With a handful of customers you already have recurring income.

“But if the script is free, why would anyone pay?” Because most people — especially those who aren’t comfortable with technology — don’t know it exists, don’t trust running a .bat file, and don’t have time to configure Task Scheduler. You’re not selling the script: you’re selling peace of mind, time saved and technical trust.

📋 Packaging and Pricing

• Define a clear package: for example “Monthly Preventive Maintenance” with temporary file cleanup, disk space check and a quick system health check.
• Document before and after: a screenshot of the space freed or the boot time before and after is far more convincing than “I cleaned your PC”.
• Charge for the value delivered, not just the time: a PC that’s fast again can be worth much more to the customer than the minutes the remote session took.
• Offer a recurring plan: a fixed monthly package is more attractive to the customer (predictable cost) and better for you (predictable income).
• Start with entry prices to build a portfolio: first customers generate testimonials and referrals, which are worth more in the long run.

🧰 Other Maintenance That Pairs With This Script

• Disk space analysis: tools like WizTree show what’s eating space beyond temporary files — forgotten downloads, old installer folders.
• Startup programs: many apps add themselves to startup and slow the boot. Review the list in Task Manager → Startup apps.
• Updates: keep Windows and programs up to date — Winget updates every program with one command, and drivers can be updated without paid tools.
• Hardware diagnosis: if the PC is still slow after cleaning, the cause may be physical — see 4 commands that show the PC’s real health.
• System file repair: if Windows itself is misbehaving, see SFC and DISM.

🔧 Common Errors When Running the Script

FAQ