Spring Cleaning Your Mac: A Once-a-Year Routine

I do my Mac’s spring cleaning the same weekend I clean out the garage. Both have the same general structure — most of what’s in there hasn’t been touched in a year, half of it I forgot existed, and I always find a few things I genuinely needed but couldn’t locate. Mac edition is faster than the garage and produces fewer cardboard boxes.

If you’ve been using the same Mac for a year or more without doing real maintenance, this is the once-a-year deep pass that resets things. Plan for 60–90 minutes. Coffee helps.

Before you start: back up

Take a Time Machine backup right now. If you don’t have a Time Machine drive, plug one in and start one. The cleanup steps below are mostly safe, but “mostly safe” is not “always safe,” and the one time you need a backup is the one time you didn’t take it. While the backup runs (it’ll take 10–60 minutes depending on size), keep reading.

Step 1: take stock of what you’ve got

Open System Settings → General → Storage. Wait for the colored bars to populate fully — on a near-full SSD this can take a while. The breakdown shows you what’s actually using space. The categories you’ll typically find:

• Apps — usually 20–80 GB. Less than people think.
• Documents — wildcard. Could be 5 GB, could be 200 GB if you’ve been dumping downloads.
• System Data — the big one. Often 30–80+ GB after a year. This is where caches, logs, and macOS housekeeping live.
• Photos, Mail, Music, Messages — only matter if they’re huge.

Note the totals. You’ll feel good comparing them at the end.

Step 2: clear out Downloads

The Downloads folder is the worst offender on every Mac I’ve ever audited. Open Finder → Downloads. Switch to List view. Sort by Date Added, oldest first.

Go through them. Delete:

• Old DMGs and PKGs (installers — you don’t need them after installing)
• ZIP files you’ve already extracted
• PDFs you read once and don’t need
• Random downloads you don’t recognize at all
• Old screenshots that escaped from your Desktop

I almost always find 5–20 GB of pure trash here. On one client’s MacBook Air last year I cleared 47 GB just from Downloads.

Step 3: empty the bloated app folder

Open Applications. Sort by Date Last Opened (in column view, you may need to enable that column via View → Show View Options). Anything you haven’t opened in 6+ months is a candidate for removal.

But — and this is the catch — dragging apps to the Trash doesn’t actually remove them cleanly. It leaves behind:

• Preference files in ~/Library/Preferences/
• Caches in ~/Library/Caches/
• Application Support files (sometimes large — Slack and Discord are notorious)
• Log files in ~/Library/Logs/
• LaunchAgents that keep loading at boot
• Helper apps that may not show up in Applications at all

A proper uninstall finds all of these. Doing it by hand for 15 apps takes a long time. Doing it with a tool that handles it — much faster.

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Step 4: tackle System Data

System Data is the catch-all macOS uses for stuff that doesn’t fit other categories. It includes:

• Caches (system + user)
• Logs (system + per-app)
• iOS device backups (these can be huge — check ~/Library/Application Support/MobileSync/Backup/)
• Old iOS Software Updates (~/Library/iTunes/iPhone Software Updates/)
• Mail downloads
• Time Machine local snapshots
• Language files for apps you’ll never use in 25 languages

Some of this clears with a restart (local snapshots). Some you can clear safely (caches). Some — like old iOS backups — you may want to keep but trim. Walk through each carefully. The two biggest wins for most people are old iOS backups and the language files apps ship with by default.

Step 5: audit Photos and Mail

If iCloud Photos is enabled, turn on “Optimize Mac Storage” in Photos → Settings → iCloud. Full-resolution originals stay in iCloud; only the ones you’re actively viewing get downloaded. This commonly frees 20–50 GB.

For Mail, especially with old IMAP accounts: Mail keeps local copies of every message. Mail → Settings → Accounts → [your account] → Advanced → “Download Attachments.” If it’s set to “All,” you’ve got a copy of every PDF and 30 MB image anyone has ever sent you. Switch to “Recent” or “None.” Then quit and restart Mail.

Step 6: review login items and background agents

System Settings → General → Login Items. Two lists:

1. Open at Login — apps that launch when you sign in
2. Allow in the Background — helpers that run silently

Walk through both. Anything you don’t recognize, anything from an app you removed years ago, anything you don’t actively need — turn it off. Background agents are the silent killer of Mac performance over time. Each one uses RAM, sometimes CPU, and slows down boot.

Step 7: privacy permissions audit

System Settings → Privacy & Security. Click through:

• Location Services
• Contacts
• Calendars
• Reminders
• Photos
• Camera
• Microphone
• Screen Recording
• Full Disk Access
• Files and Folders
• Accessibility

For each, look at the apps with permission. Anything you removed, anything you forgot you installed, anything that has no business with that permission — uncheck or remove. You’ll likely find a Zoom from 2022 still in Camera, a screen-recording app you tried once still listed, and Full Disk Access granted to something you don’t recognize.

This isn’t paranoia — it’s basic hygiene. Accumulated permissions are a real risk if any of those old apps ever get compromised.

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Step 8: update everything

Now that you’ve trimmed:

1. App Store → Updates. Run all of them.
2. Apple Menu → System Settings → General → Software Update. Apply any pending macOS update (a point release, not necessarily a major version jump — see below).
3. For non-App Store apps, open them one at a time and check for updates in their menu.

Updates fix bugs, patch security holes, and often improve performance on newer macOS versions. They also reset various caches that can be subtly broken.

A note on major macOS upgrades

If your Mac is running Sonoma 14 and Sequoia 15 is available, don’t necessarily upgrade as part of spring cleaning unless you’ve already verified your critical apps work on Sequoia. Major macOS upgrades occasionally break workflows. Treat them as a separate decision from cleanup.

Step 9: physical cleaning

This part is annoying because it requires standing up, but it matters:

• Wipe the screen. Slightly damp microfiber. Never paper towels. Never Windex.
• Clean the keyboard. Compressed air at an angle. If keys feel sticky, that’s another problem (covered in Apple’s keyboard service program for older models).
• Check the bottom case vents. MacBook Pros pull air through small slots in the bottom. Dust accumulates. A quick blast with compressed air helps thermals.
• Ports. If a charging cable feels loose, the port is probably full of pocket lint. Compressed air. (Don’t poke things in there.)
• Bottom case feet. If they’re peeling, replacement feet are about $5 on Amazon. Loose feet = vibration on hard surfaces = annoying.

Step 10: the final restart

After all this, restart. Not sleep — restart. Apple Menu → Restart. Let it come up fresh. Open System Settings → Storage again. Compare to where you started.

If you started at 90% full and ended at 65%, that’s typical for a year of accumulated drift. If you ended close to where you started, something specific is using your space — usually Photos, an old iOS backup, or a single huge file (that 90 GB Final Cut project you forgot existed).

What to expect afterward

Boot will be faster. RAM pressure will drop because fewer login items are active. Battery may improve modestly because background processes are gone. The general feeling of “everything is sluggish” should largely disappear.

This won’t fix every problem. If your Mac was already old and slow because of legitimate hardware limits — 4 GB of RAM, a spinning hard drive — cleanup helps but won’t perform miracles. For software-side accumulation, though, an annual deep clean genuinely makes a Mac feel several years newer.

Set a calendar reminder for the same weekend next year. The buildup will start over the day after you finish.