diff --git a/README.md b/README.md
index 22f85cc..da1e9c0 100644
--- a/README.md
+++ b/README.md
@@ -50,7 +50,8 @@ mole update               # Update Mole
 mole --help               # Show help
 ```
 
-> 💡 New to terminal? Check [小白使用指南](./GUIDE.md) · Homebrew users: `brew upgrade mole` to update
+> 💡 New to terminal? Check [小白使用指南](./GUIDE.md) · Homebrew users: `brew upgrade mole` to update  
+> ⚠️ **Recommended:** Always run `mole clean --dry-run` first to preview changes before cleanup
 
 ## Features
 
@@ -60,19 +61,19 @@ mole --help               # Show help
 $ mole clean
 
 ▶ System essentials
-  ✓ User app cache (45.2GB)        # Caches, logs, trash (20-50GB)
+  ✓ User app cache (45.2GB)        # Caches, logs, trash 20-50GB typical
   ✓ User app logs (2.1GB)
   ✓ Trash (12.3GB)
 
-▶ Browser cleanup                   # Chrome, Safari, Arc (5-15GB)
+▶ Browser cleanup                   # Chrome, Safari, Arc 5-15GB typical
   ✓ Chrome cache (8.4GB)
   ✓ Safari cache (2.1GB)
 
-▶ Developer tools                   # npm, Docker, Xcode (15-40GB)
+▶ Developer tools                   # npm, Docker, Xcode 15-40GB typical
   ✓ Xcode derived data (9.1GB)
   ✓ Node.js cache (14.2GB)
 
-▶ Others                            # Cloud, Office, Media (10-40GB)
+▶ Others                            # Cloud, Office, Media 10-40GB typical
   ✓ Dropbox cache (5.2GB)
   ✓ Spotify cache (3.1GB)
 
@@ -105,12 +106,12 @@ $ mole uninstall
 
 🗑️  Uninstalling: Adobe Creative Cloud
   ✓ Removed application              # /Applications/
-  ✓ Cleaned 52 related files         # ~/Library/ (12 locations)
+  ✓ Cleaned 52 related files         # ~/Library/ across 12 locations
     - Support files & caches         # Application Support, Caches
     - Preferences & logs             # Preferences, Logs
     - WebKit storage & cookies       # WebKit, HTTPStorages
     - Extensions & plugins           # Internet Plug-Ins, Services
-    - System files (sudo)            # /Library/, Launch daemons
+    - System files with sudo         # /Library/, Launch daemons
 
 ====================================================================
 🎉 UNINSTALLATION COMPLETE!
@@ -145,10 +146,14 @@ Total: 156.8GB
 
 ## FAQ
 
-1. **Will Mole delete important files?** - No. Mole has built-in protection and skips system-critical files.
-2. **Can I undo cleanup operations?** - Cache files are safe to delete and will regenerate automatically.
+1. **Will Mole delete important files?** - No. Mole has built-in protection for:
+   - System-critical files like Input Methods, Dock, and System Preferences
+   - User data from IDEs like JetBrains DataGrip and VS Code, plus database tools
+   - License data from paid apps like 1Password and Adobe products
+   - App settings are only removed when you explicitly uninstall the app
+2. **Can I undo cleanup operations?** - Cache files are safe to delete and will regenerate automatically. For important data protection, use the whitelist feature via `mole clean --whitelist`.
 3. **How often should I run cleanup?** - Once a month is sufficient. Run when disk space is low.
-4. **Is it safe to use?** - Yes. The tool previews what will be deleted before any action (`--dry-run`).
+4. **Is it safe to use?** - Yes. **Always run `mole clean --dry-run` first** to preview what will be deleted before any action.
 
 ## Support
 
diff --git a/bin/clean.sh b/bin/clean.sh
index 30743c8..6ba83d8 100755
--- a/bin/clean.sh
+++ b/bin/clean.sh
@@ -819,6 +819,29 @@ perform_cleanup() {
             fi
         done
     fi
+    # Also check for non-com.* folders that may contain user data
+    for support_dir in ~/Library/Application\ Support/*; do
+        [[ -d "$support_dir" ]] || continue
+        local dir_name=$(basename "$support_dir")
+        # Skip if it starts with com. (already processed) or is in dot directories
+        [[ "$dir_name" == com.* || "$dir_name" == .* ]] && continue
+        # CRITICAL: Protect important data folders (JetBrains, database tools, etc.)
+        if should_protect_data "$dir_name"; then
+            continue
+        fi
+        # Only clean if significant size and looks like app data, but be conservative
+        # Skip common system/user folders
+        case "$dir_name" in
+            "CrashReporter"|"AddressBook"|"CallHistoryDB"|"CallHistoryTransactions"|\
+            "CloudDocs"|"icdd"|"IdentityServices"|"Mail"|"CallServices"|\
+            "com.apple."*|"Adobe"|"Google"|"Mozilla"|"Netscape"|"Yahoo"|\
+            "AddressBook"|"iCloud"|"iLifeMediaBrowser"|"MobileSync"|\
+            "CallHistory"|"FaceTime"|"Twitter")
+                # System or commonly used folders, skip
+                continue
+                ;;
+        esac
+    done
     echo " ${GREEN}✓${NC} Complete ($data_count removed)"
 
     # Check for orphaned preferences (with protection for critical system settings)
diff --git a/lib/common.sh b/lib/common.sh
index 4a30971..346edf5 100755
--- a/lib/common.sh
+++ b/lib/common.sh
@@ -332,12 +332,16 @@ readonly DATA_PROTECTED_BUNDLES=(
     "com.dashlane.*"                   # Dashlane
     "com.bitwarden.*"                  # Bitwarden
     "com.keepassx.*"                   # KeePassXC
-    "com.jetbrains.*"                  # JetBrains IDEs (dev tools)
+    "com.jetbrains.*"                  # JetBrains IDEs (dev tools with user data)
+    "JetBrains*"                       # JetBrains Application Support folders
     "com.sublimetext.*"                # Sublime Text (paid)
     "com.panic.transmit*"              # Transmit (paid)
     "com.sequelpro.*"                  # Database tools
     "com.sequel-ace.*"
     "com.tinyapp.*"                    # TablePlus (paid)
+    "com.dbeaver.*"                    # DBeaver (database tool)
+    "com.navicat.*"                    # Navicat (database tool)
+    "com.mongodb.compass"              # MongoDB Compass
     "com.adobe.*"                      # Adobe Creative Suite (design tools)
     "com.bohemiancoding.*"             # Sketch
     "com.figma.*"                      # Figma