Visualforce page : Export Results to Excel or CSV

I have created a VF page which fetch the records from object based on the critirea selected by user. Based the critirea I have created a results section in VF page which shows all the relevant information. I have added a custom button " export to excel". Whenever users click this button , it should export all the RESULTS to excel. In order to achieve this , I have created a 2nd VF page same as my original page but with "contentype " attribute. When i click the button , It is exporting the results but It is also exporting the some irrelevant data .
VF Page:
<apex:page controller="Fetchsiteplacement12" tabStyle="Site_Placements__c" sidebar="True" contentType="application/vnd.ms-excel#filename.xls"   language="en-US" cache="True">



    <apex:form >
      
        <apex:pageBlock >
        <apex:messages />
            <apex:pageBlockButtons location="Both">
        
            <apex:commandButton value="Fetch" action="{!FetchSPRec}"/>
            <apex:commandButton value="Cancel" action="{!CancelSPRec}"/>
          
            </apex:pageBlockButtons>
          
          
              <apex:pageBlockSection title="Results">
            <apex:pageBlockSectionItem >
                <apex:pageBlockTable value="{!spRec}" var="site" columnsWidth="500px, 500px" >
                    <apex:column value="{!se.Name}"/>
                    <apex:column value="{!se.Placement__c}"/>
                    <apex:column value="{!se.Level_Max__c}"/>
                  
                 </apex:pageBlockTable>
                 </apex:pageBlockSectionItem>
               
           </apex:pageBlockSection>
        </apex:pageblock>
                </apex:form>
</apex:page>


APex class:

And, in the apex class , I am using this :

public PageReference FetchExcelReport() {
        PageReference nextpage = new PageReference('/apex/ExcelReportPage');
return nextpage;
    }


Below is irrelevent info:

if(!window.sfdcPage){window.sfdcPage = new ApexDetailPage();} UserContext.initialize({"networkId":"","locale":"en_US","labelLastModified":"1393912808000","isDefaultNetwork":true,"today":"3/5/2014 4:23 PM","timeFormat":"h:mm a","userPreferences":[{"index":112,"name":"HideInlineEditSplash","value":false},{"index":114,"name":"OverrideTaskSendNotification","value":false},{"index":115,"name":"DefaultTaskSendNotification","value":false},{"index":119,"name":"HideUserLayoutStdFieldInfo","value":false},{"index":116,"name":"HideRPPWarning","value":false},{"index":87,"name":"HideInlineSchedulingSplash","value":false},{"index":88,"name":"HideCRUCNotification","value":false},{"index":89,"name":"HideNewPLESplash","value":false},{"index":90,"name":"HideNewPLEWarnIE6","value":false},{"index":122,"name":"HideOverrideSharingMessage","value":false},{"index":91,"name":"HideProfileILEWarn","value":false},{"index":93,"name":"HideProfileElvVideo","value":false},{"index":97,"name":"ShowPicklistEditSplash","value":false},{"index":92,"name":"HideDataCategorySplash","value":false},{"index":128,"name":"ShowDealView","value":false},{"index":129,"name":"HideDealViewGuidedTour","value":false},{"index":132,"name":"HideKnowledgeFirstTimeSetupMsg","value":false},{"index":104,"name":"DefaultOffEntityPermsMsg","value":false},{"index":135,"name":"HideNewCsnSplash","value":false},{"index":101,"name":"HideBrowserWarning","value":false},{"index":139,"name":"HideDashboardBuilderGuidedTour","value":false},{"index":140,"name":"HideSchedulingGuidedTour","value":false},{"index":180,"name":"HideReportBuilderGuidedTour","value":true},{"index":183,"name":"HideAssociationQueueCallout","value":false},{"index":194,"name":"HideQTEBanner","value":false},{"index":193,"name":"HideChatterOnboardingSplash","value":true},{"index":195,"name":"HideSecondChatterOnboardingSplash","value":true},{"index":270,"name":"HideIDEGuidedTour","value":true},{"index":282,"name":"HideQueryToolGuidedTour","value":false},{"index":196,"name":"HideCSIGuidedTour","value":true},{"index":271,"name":"HideFewmetGuidedTour","value":false},{"index":272,"name":"HideEditorGuidedTour","value":true},{"index":205,"name":"HideApexTestGuidedTour","value":false},{"index":206,"name":"HideSetupProfileHeaderTour","value":true},{"index":207,"name":"HideSetupProfileObjectsAndTabsTour","value":true},{"index":213,"name":"DefaultOffArticleTypeEntityPermMsg","value":false},{"index":214,"name":"HideSelfInfluenceGetStarted","value":false},{"index":215,"name":"HideOtherInfluenceGetStarted","value":false},{"index":216,"name":"HideFeedToggleGuidedTour","value":false},{"index":268,"name":"ShowChatterTab178GuidedTour","value":false},{"index":275,"name":"HidePeopleTabDeprecationMsg","value":false},{"index":276,"name":"HideGroupTabDeprecationMsg","value":false},{"index":222,"name":"TouchExternalLinkReminderSuppression","value":false},{"index":224,"name":"HideUnifiedSearchGuidedTour","value":true},{"index":226,"name":"ShowDevContextMenu","value":true},{"index":227,"name":"HideWhatRecommenderForActivityQueues","value":false},{"index":228,"name":"HideLiveAgentFirstTimeSetupMsg","value":false},{"index":232,"name":"HideGroupAllowsGuestsMsgOnMemberWidget","value":false},{"index":233,"name":"HideGroupAllowsGuestsMsg","value":false},{"index":234,"name":"HideWhatAreGuestsMsg","value":false},{"index":235,"name":"HideNowAllowGuestsMsg","value":false},{"index":236,"name":"HideSocialAccountsAndContactsGuidedTour","value":false},{"index":237,"name":"HideAnalyticsHomeGuidedTour","value":true},{"index":238,"name":"ShowQuickCreateGuidedTour","value":false},{"index":245,"name":"HideFilePageGuidedTour","value":false},{"index":250,"name":"HideForecastingGuidedTour","value":false},{"index":242,"name":"TouchHideOptoutHover","value":false},{"index":251,"name":"HideBucketFieldGuide","value":false},{"index":263,"name":"HideSmartSearchCallOut","value":true},{"index":265,"name":"HideSocialProfilesKloutSplashScreen","value":false},{"index":273,"name":"ShowForecastingQuotaAttainment","value":false},{"index":280,"name":"HideForecastingQuotaColumn","value":false},{"index":301,"name":"HideManyWhoGuidedTour","value":false},{"index":284,"name":"HideExternalSharingModelGuidedTour","value":false},{"index":298,"name":"HideFileSyncBannerMsg","value":false},{"index":299,"name":"HideTestConsoleGuidedTour","value":true},{"index":300,"name":"HideNetworkSetupOverlayGettingStarted","value":false},{"index":302,"name":"HideManyWhoInlineEditTip","value":false},{"index":303,"name":"HideSetupV2WelcomeMessage","value":false},{"index":312,"name":"ForecastingShowQuantity","value":false},{"index":313,"name":"HideDataImporterIntroMsg","value":false},{"index":314,"name":"HideEnvironmentHubLightbox","value":false},{"index":316,"name":"HideSetupV2GuidedTour","value":false},{"index":317,"name":"HideFileSyncMobileDownloadDialog","value":false},{"index":318,"name":"HideHelpBannerQuickActionList","value":false},{"index":321,"name":"HideCustomEntityQuickActionCallout","value":true},{"index":322,"name":"HideEnhancedProfileHelpBubble","value":false},{"index":328,"name":"ForecastingHideZeroRows","value":false},{"index":330,"name":"HideEmbeddedComponentsFeatureCallout","value":true},{"index":340,"name":"HideS1BrowserUI","value":false}],"orgPreferences":[{"index":257,"name":"TabOrganizer","value":true}],"startOfWeek":"1","isAccessibleMode":false,"ampm":["AM","PM"],"renderMode":"RETRO","userId":"00570000002Nayk","dateTimeFormat":"M/d/yyyy h:mm a","dateFormat":"M/d/yyyy","uiSkin":"Theme3","language":"en_US","siteUrlPrefix":""});


function twistSection(twisty, sectionId) { var parentDiv = twisty; while (parentDiv.tagName != 'DIV') { parentDiv = parentDiv.parentNode; } var div = parentDiv.nextSibling; var elemWasOn = false; if (div.style.display != 'none') { div.style.display = 'none'; twisty.className ='showListButton'; twisty.alt = twisty.title = 'Show Section - '+twisty.name; elemWasOn = true; } else { div.style.display = 'block'; twisty.className = 'hideListButton'; twisty.alt = twisty.title = 'Hide Section - '+twisty.name; } return !elemWasOn; } var registeredSections = new Array(); function registerTwistableSection(headerId, mainTableId) { var obj = new Object(); obj.headerId = headerId; obj.mainTableId = mainTableId; registeredSections[registeredSections.length] = obj; } function twistAllSections(on) { for (var i = 0; i < registeredSections.length; i++) { var obj = registeredSections[i]; var img; img = document.getElementById('img_' + obj.headerId); if (on && 'showListButton' == img.className) { twistSection(img, obj.headerId, obj.mainTableId); } else if (!on && 'hideListButton' == img.className) { twistSection(img, obj.headerId, obj.mainTableId); } } } function toggleSection(headerId, on){ var sectionHead = document.getElementById('head_'+headerId+'_j_id0_j_id1_j_id2'); var body = sectionHead.nextSibling; var disp = on ? 'block' : 'none'; sectionHead.style.display = disp; body.style.display = disp; } function registerTwistableSections_j_id0_j_id1_j_id2() { registerTwistableSection('j_id0_j_id1_j_id2_j_id7', 'j_id0_j_id1_j_id2'); registerTwistableSection('j_id0_j_id1_j_id2_j_id22', 'j_id0_j_id1_j_id2'); registerTwistableSection('j_id0_j_id1_j_id2_j_id27', 'j_id0_j_id1_j_id2'); } registerTwistableSections_j_id0_j_id1_j_id2();


Kindly help me.