Hello All

Please find the below,   controller and a part of VF Page. Here the refresh not working when User clicks on Verify Asset button, the new one , which User has to enter is populating 3 Fields (Location, Warranty, Date) with the Previous entered Values. Please someone help in change of code or where have to change to get empty of those 3 fields on addition of new?

Thanks in Advance!
TrialHead Aspirant

VF Page:
========

 <apex:outputPanel rendered="{!renderAddAsset}">
                
                Model Number:<apex:inputText value="{!modelNumber}"/> 
                Serial Number:<apex:inputText value="{!serialNumber}"/>
                Install Date:<apex:input value="{!installDate}" 
                    html-placeholder="Install Date" 
                                              type="date"/>
                <apex:selectList label="Fields" value="{!selectedLocationId}" multiselect="false" size="1" >
                     <apex:selectOptions value="{!LocationSelections}" />
                </apex:selectList>
                In Warranty?<apex:selectList id="WarrantyStatusId" value="{!WarrantyStatus}" size="1">
                    <apex:selectOption itemValue="true" itemLabel="Yes"/>
                    <apex:selectOption itemValue="false" itemLabel="No"/>
                </apex:selectList> 
                 <apex:commandButton action="{!verifyAsset}" value="Verify Asset" reRender="apexform" status="spinnerStatus" styleclass="slds-button slds-button_brand"/>
                 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
                <apex:commandButton action="{!cancelAddAsset}" value="Cancel" reRender="apexform" status="spinnerStatus" styleclass="slds-button slds-button_brand"/>
            </apex:outputPanel>

Controller:
============
public PageReference verifyAsset(){
        resetError();
        Boolean hasErrors = false;
       
        
        if(modelNumber == '' || modelNumber == null){
            apexpages.addMessage(new ApexPages.message(Apexpages.Severity.ERROR,'Please enter model number.')); 
            hasErrors = true;
        }
        if(selectedLocationId == 'Select service location' ){
            apexpages.addMessage(new ApexPages.message(Apexpages.Severity.ERROR,'Please select a location.')); 
            hasErrors = true;
        }
        if(!string.isBlank(modelNumber)  && !modelNumber.isAlphanumeric() ){
            apexpages.addMessage(new ApexPages.message(Apexpages.Severity.ERROR,'Model Number can only contain alphanumeric characters.')); 
            hasErrors = true;
        }
        if(hasErrors){
            assetError = true;
            return null;
        }