diff --git a/modules/juce_audio_devices/native/juce_win32_WASAPI.cpp b/modules/juce_audio_devices/native/juce_win32_WASAPI.cpp
index b60cdd400b..4940d3e676 100644
--- a/modules/juce_audio_devices/native/juce_win32_WASAPI.cpp
+++ b/modules/juce_audio_devices/native/juce_win32_WASAPI.cpp
@@ -632,7 +632,7 @@ public:
     {
         closeClient();
         captureClient = nullptr;
-        reservoir.setSize (0);
+        reservoir.reset();
     }
 
     template <class SourceType>
diff --git a/modules/juce_audio_plugin_client/AAX/juce_AAX_Wrapper.cpp b/modules/juce_audio_plugin_client/AAX/juce_AAX_Wrapper.cpp
index 5564cd7ede..d2f7ddf16a 100644
--- a/modules/juce_audio_plugin_client/AAX/juce_AAX_Wrapper.cpp
+++ b/modules/juce_audio_plugin_client/AAX/juce_AAX_Wrapper.cpp
@@ -442,7 +442,7 @@ struct AAXClasses
             if (chunkID != juceChunkType)
                 return AAX_CEffectParameters::GetChunkSize (chunkID, oSize);
 
-            tempFilterData.setSize (0);
+            tempFilterData.reset();
             pluginInstance->getStateInformation (tempFilterData);
             *oSize = (uint32_t) tempFilterData.getSize();
             return AAX_SUCCESS;
@@ -458,7 +458,7 @@ struct AAXClasses
 
             oChunk->fSize = (int32_t) tempFilterData.getSize();
             tempFilterData.copyTo (oChunk->fData, 0, tempFilterData.getSize());
-            tempFilterData.setSize (0);
+            tempFilterData.reset();
 
             return AAX_SUCCESS;
         }
diff --git a/modules/juce_audio_plugin_client/RTAS/juce_RTAS_Wrapper.cpp b/modules/juce_audio_plugin_client/RTAS/juce_RTAS_Wrapper.cpp
index 40ce8d18bd..3ebefdc6b7 100644
--- a/modules/juce_audio_plugin_client/RTAS/juce_RTAS_Wrapper.cpp
+++ b/modules/juce_audio_plugin_client/RTAS/juce_RTAS_Wrapper.cpp
@@ -627,7 +627,7 @@ protected:
     {
         if (chunkID == juceChunkType)
         {
-            tempFilterData.setSize (0);
+            tempFilterData.reset();
             juceFilter->getStateInformation (tempFilterData);
 
             *size = sizeof (SFicPlugInChunkHeader) + tempFilterData.getSize();
@@ -647,7 +647,7 @@ protected:
             chunk->fSize = sizeof (SFicPlugInChunkHeader) + tempFilterData.getSize();
             tempFilterData.copyTo ((void*) chunk->fData, 0, tempFilterData.getSize());
 
-            tempFilterData.setSize (0);
+            tempFilterData.reset();
 
             return noErr;
         }
@@ -659,7 +659,7 @@ protected:
     {
         if (chunkID == juceChunkType)
         {
-            tempFilterData.setSize (0);
+            tempFilterData.reset();
 
             if (chunk->fSize - sizeof (SFicPlugInChunkHeader) > 0)
             {
diff --git a/modules/juce_audio_plugin_client/VST/juce_VST_Wrapper.cpp b/modules/juce_audio_plugin_client/VST/juce_VST_Wrapper.cpp
index 719e05604c..855dc06c06 100644
--- a/modules/juce_audio_plugin_client/VST/juce_VST_Wrapper.cpp
+++ b/modules/juce_audio_plugin_client/VST/juce_VST_Wrapper.cpp
@@ -977,7 +977,7 @@ public:
         if (filter == nullptr)
             return 0;
 
-        chunkMemory.setSize (0);
+        chunkMemory.reset();
         if (onlyStoreCurrentProgramData)
             filter->getCurrentProgramStateInformation (chunkMemory);
         else
@@ -996,7 +996,7 @@ public:
     {
         if (filter != nullptr)
         {
-            chunkMemory.setSize (0);
+            chunkMemory.reset();
             chunkMemoryTime = 0;
 
             if (byteSize > 0 && data != nullptr)
@@ -1023,8 +1023,8 @@ public:
              && chunkMemoryTime < juce::Time::getApproximateMillisecondCounter() - 2000
              && ! recursionCheck)
         {
+            chunkMemory.reset();
             chunkMemoryTime = 0;
-            chunkMemory.setSize (0);
         }
 
        #if JUCE_MAC
diff --git a/modules/juce_core/memory/juce_MemoryBlock.cpp b/modules/juce_core/memory/juce_MemoryBlock.cpp
index f3be0f03d5..a827037135 100644
--- a/modules/juce_core/memory/juce_MemoryBlock.cpp
+++ b/modules/juce_core/memory/juce_MemoryBlock.cpp
@@ -127,8 +127,7 @@ void MemoryBlock::setSize (const size_t newSize, const bool initialiseToZero)
     {
         if (newSize <= 0)
         {
-            data.free();
-            size = 0;
+            reset();
         }
         else
         {
@@ -149,6 +148,12 @@ void MemoryBlock::setSize (const size_t newSize, const bool initialiseToZero)
     }
 }
 
+void MemoryBlock::reset()
+{
+    data.free();
+    size = 0;
+}
+
 void MemoryBlock::ensureSize (const size_t minimumSize, const bool initialiseToZero)
 {
     if (size < minimumSize)
diff --git a/modules/juce_core/memory/juce_MemoryBlock.h b/modules/juce_core/memory/juce_MemoryBlock.h
index 801a9e1f5b..30bb3cab24 100644
--- a/modules/juce_core/memory/juce_MemoryBlock.h
+++ b/modules/juce_core/memory/juce_MemoryBlock.h
@@ -108,9 +108,9 @@ public:
 
     /** Resizes the memory block.
 
-        This will try to keep as much of the block's current content as it can,
-        and can optionally be made to clear any new space that gets allocated at
-        the end of the block.
+        Any data that is present in both the old and new sizes will be retained.
+        When enlarging the block, the new space that is allocated at the end can either be
+        cleared, or left uninitialised.
 
         @param newSize                      the new desired size for the block
         @param initialiseNewSpaceToZero     if the block gets enlarged, this determines
@@ -133,6 +133,9 @@ public:
     void ensureSize (const size_t minimumSize,
                      bool initialiseNewSpaceToZero = false);
 
+    /** Frees all the blocks data, setting its size to 0. */
+    void reset();
+
     //==============================================================================
     /** Fills the entire memory block with a repeated byte value.
         This is handy for clearing a block of memory to zero.
diff --git a/modules/juce_gui_extra/native/juce_android_WebBrowserComponent.cpp b/modules/juce_gui_extra/native/juce_android_WebBrowserComponent.cpp
index dcf786d732..d449bae366 100644
--- a/modules/juce_gui_extra/native/juce_android_WebBrowserComponent.cpp
+++ b/modules/juce_gui_extra/native/juce_android_WebBrowserComponent.cpp
@@ -41,17 +41,17 @@ void WebBrowserComponent::goToURL (const String& url,
 {
     lastURL = url;
 
-    lastHeaders.clear();
     if (headers != nullptr)
         lastHeaders = *headers;
+    else
+        lastHeaders.clear();
 
-    lastPostData.setSize (0);
     if (postData != nullptr)
         lastPostData = *postData;
+    else
+        lastPostData.reset();
 
     blankPageShown = false;
-
-
 }
 
 void WebBrowserComponent::stop()
diff --git a/modules/juce_gui_extra/native/juce_linux_WebBrowserComponent.cpp b/modules/juce_gui_extra/native/juce_linux_WebBrowserComponent.cpp
index 1a36b7407b..5aafe3a6a7 100644
--- a/modules/juce_gui_extra/native/juce_linux_WebBrowserComponent.cpp
+++ b/modules/juce_gui_extra/native/juce_linux_WebBrowserComponent.cpp
@@ -46,17 +46,17 @@ void WebBrowserComponent::goToURL (const String& url,
 {
     lastURL = url;
 
-    lastHeaders.clear();
     if (headers != nullptr)
         lastHeaders = *headers;
+    else
+        lastHeaders.clear();
 
-    lastPostData.setSize (0);
     if (postData != nullptr)
         lastPostData = *postData;
+    else
+        lastPostData.reset();
 
     blankPageShown = false;
-
-
 }
 
 void WebBrowserComponent::stop()
diff --git a/modules/juce_gui_extra/native/juce_mac_WebBrowserComponent.mm b/modules/juce_gui_extra/native/juce_mac_WebBrowserComponent.mm
index 286ff804b3..46d8da7be0 100644
--- a/modules/juce_gui_extra/native/juce_mac_WebBrowserComponent.mm
+++ b/modules/juce_gui_extra/native/juce_mac_WebBrowserComponent.mm
@@ -265,13 +265,15 @@ void WebBrowserComponent::goToURL (const String& url,
 {
     lastURL = url;
 
-    lastHeaders.clear();
     if (headers != nullptr)
         lastHeaders = *headers;
+    else
+        lastHeaders.clear();
 
-    lastPostData.setSize (0);
     if (postData != nullptr)
         lastPostData = *postData;
+    else
+        lastPostData.reset();
 
     blankPageShown = false;
 
diff --git a/modules/juce_gui_extra/native/juce_win32_WebBrowserComponent.cpp b/modules/juce_gui_extra/native/juce_win32_WebBrowserComponent.cpp
index 0a5b307235..fdc6be7b34 100644
--- a/modules/juce_gui_extra/native/juce_win32_WebBrowserComponent.cpp
+++ b/modules/juce_gui_extra/native/juce_win32_WebBrowserComponent.cpp
@@ -214,13 +214,15 @@ void WebBrowserComponent::goToURL (const String& url,
 {
     lastURL = url;
 
-    lastHeaders.clear();
     if (headers != nullptr)
         lastHeaders = *headers;
+    else
+        lastHeaders.clear();
 
-    lastPostData.setSize (0);
     if (postData != nullptr)
         lastPostData = *postData;
+    else
+        lastPostData.reset();
 
     blankPageShown = false;