1. Pull up the XML file associated to the class/trigger, it will look something like this:
<?xml version="1.0" encoding="UTF-8"?>2. Where is says <status> replace "Active" with either "Inactive" or "Deleted" then save the XML.
<ApexClass xmlns="http://soap.sforce.com/2006/04/metadata">
<apiVersion>21.0</apiVersion>
<packageVersions>
<majorNumber>1</majorNumber>
<minorNumber>3</minorNumber>
<namespace>households</namespace>
</packageVersions>
<status>Active</status>
</ApexClass>
3. Now deploy this class/trigger to production and it will be removed!