diff --git a/SDImageCache.m b/SDImageCache.m
index 4d1a1aa..b5c4ac6 100644
--- a/SDImageCache.m
+++ b/SDImageCache.m
@@ -4,7 +4,7 @@
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
- */ 
+ */
 
 #import "SDImageCache.h"
 #import <CommonCrypto/CommonDigest.h>
@@ -39,7 +39,7 @@ static SDImageCache *instance;
         // Init the disk cache
         NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
         diskCachePath = [[[paths objectAtIndex:0] stringByAppendingPathComponent:@"ImageCache"] retain];
-        		
+
         if (![[NSFileManager defaultManager] fileExistsAtPath:diskCachePath])
         {
             [[NSFileManager defaultManager] createDirectoryAtPath:diskCachePath attributes:nil];
@@ -52,13 +52,13 @@ static SDImageCache *instance;
         // Subscribe to app events
         [[NSNotificationCenter defaultCenter] addObserver:self
                                                  selector:@selector(didReceiveMemoryWarning:)
-                                                     name:UIApplicationDidReceiveMemoryWarningNotification  
+                                                     name:UIApplicationDidReceiveMemoryWarningNotification
                                                    object:nil];
-        
+
         [[NSNotificationCenter defaultCenter] addObserver:self
                                                  selector:@selector(willTerminate)
-                                                     name:UIApplicationWillTerminateNotification  
-                                                   object:nil];        
+                                                     name:UIApplicationWillTerminateNotification
+                                                   object:nil];
     }
 
     return self;
@@ -66,18 +66,18 @@ static SDImageCache *instance;
 
 - (void)dealloc
 {
-    [memCache release];
-    [diskCachePath release];
-    [cacheInQueue release];
+    [memCache release], memCache = nil;
+    [diskCachePath release], diskCachePath = nil;
+    [cacheInQueue release], cacheInQueue = nil;
 
     [[NSNotificationCenter defaultCenter] removeObserver:self
-                                                    name:UIApplicationDidReceiveMemoryWarningNotification  
-                                                  object:nil];  
+                                                    name:UIApplicationDidReceiveMemoryWarningNotification
+                                                  object:nil];
 
     [[NSNotificationCenter defaultCenter] removeObserver:self
-                                                    name:UIApplicationWillTerminateNotification  
-                                                  object:nil];  
-    
+                                                    name:UIApplicationWillTerminateNotification
+                                                  object:nil];
+
     [super dealloc];
 }
 
@@ -89,7 +89,7 @@ static SDImageCache *instance;
     {
         instance = [[SDImageCache alloc] init];
     }
-    
+
     return instance;
 }
 
@@ -134,7 +134,7 @@ static SDImageCache *instance;
     [memCache setObject:image forKey:key];
 
     if (toDisk)
-    {        
+    {
         [cacheInQueue addOperation:[[[NSInvocationOperation alloc] initWithTarget:self selector:@selector(storeKeyToDisk:) object:key] autorelease]];
     }
 }
@@ -187,7 +187,7 @@ static SDImageCache *instance;
 {
     [cacheInQueue cancelAllOperations];
     [[NSFileManager defaultManager] removeItemAtPath:diskCachePath error:nil];
-    [[NSFileManager defaultManager] createDirectoryAtPath:diskCachePath attributes:nil];    
+    [[NSFileManager defaultManager] createDirectoryAtPath:diskCachePath attributes:nil];
 }
 
 - (void)cleanDisk
diff --git a/SDWebImageDownloader.m b/SDWebImageDownloader.m
index 3fa1f46..5afaf18 100644
--- a/SDWebImageDownloader.m
+++ b/SDWebImageDownloader.m
@@ -16,7 +16,7 @@ static NSOperationQueue *downloadQueue;
 
 - (void)dealloc
 {
-    [url release];
+    [url release], url = nil;
     [super dealloc];
 }
 
@@ -33,7 +33,7 @@ static NSOperationQueue *downloadQueue;
     }
 
     [downloadQueue addOperation:downloader];
-    
+
     return downloader;
 }
 
@@ -54,7 +54,7 @@ static NSOperationQueue *downloadQueue;
     // In order to prevent from potential duplicate caching (NSURLCache + SDImageCache) we disable the cache for image requests
     NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:5];
     UIImage *image = [UIImage imageWithData:[NSURLConnection sendSynchronousRequest:request returningResponse:nil error:NULL]];
-    
+
     if (!self.isCancelled && [delegate respondsToSelector:@selector(imageDownloader:didFinishWithImage:)])
     {
         [delegate performSelector:@selector(imageDownloader:didFinishWithImage:) withObject:self withObject:image];
diff --git a/SDWebImageManager.h b/SDWebImageManager.h
index 99149e1..749f6b0 100644
--- a/SDWebImageManager.h
+++ b/SDWebImageManager.h
@@ -4,7 +4,7 @@
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
- */ 
+ */
 
 #import <UIKit/UIKit.h>
 #import "SDWebImageDownloaderDelegate.h"
diff --git a/SDWebImageManager.m b/SDWebImageManager.m
index 9eca925..8f41fe5 100644
--- a/SDWebImageManager.m
+++ b/SDWebImageManager.m
@@ -4,7 +4,7 @@
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
- */ 
+ */
 
 #import "SDWebImageManager.h"
 #import "SDImageCache.h"
@@ -26,12 +26,12 @@ static SDWebImageManager *instance;
     return self;
 }
 
-- (void) dealloc
+- (void)dealloc
 {
-    [delegates release];
-    [downloaders release];
-    [downloaderForURL release];
-    [failedURLs release];
+    [delegates release], delegates = nil;
+    [downloaders release], downloaders = nil;
+    [downloaderForURL release], downloaderForURL = nil;
+    [failedURLs release], failedURLs = nil;
     [super dealloc];
 }
 
@@ -86,7 +86,7 @@ static SDWebImageManager *instance;
         }
 
         SDWebImageDownloader *downloader = [[downloaders objectAtIndex:idx] retain];
-    
+
         [delegates removeObjectAtIndex:idx];
         [downloaders removeObjectAtIndex:idx];
 
diff --git a/UIImageView+WebCache.h b/UIImageView+WebCache.h
index fa153db..376269d 100644
--- a/UIImageView+WebCache.h
+++ b/UIImageView+WebCache.h
@@ -4,7 +4,7 @@
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
- */ 
+ */
 
 #import <UIKit/UIKit.h>
 #import "SDWebImageManagerDelegate.h"
diff --git a/UIImageView+WebCache.m b/UIImageView+WebCache.m
index b23f9cd..60655ad 100644
--- a/UIImageView+WebCache.m
+++ b/UIImageView+WebCache.m
@@ -4,7 +4,7 @@
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
- */ 
+ */
 
 #import "UIImageView+WebCache.h"
 #import "SDWebImageManager.h"
@@ -45,4 +45,4 @@
     self.image = image;
 }
 
-@end
\ No newline at end of file
+@end