Essentially Magento1 has not correct mechanism for this action unfortunately.
By this reason you should manually remove module files and database changes.
Step-by-step guide
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Follow the steps below to uninstall the extension
Guide
- Disable Magento cache
Remove following module & files:
Panel title Module files list app/code/community/TNW/Salesforce
app/design/adminhtml/default/default/layout/salesforce.xml
app/design/adminhtml/default/default/template/salesforce
app/etc/modules/TNW_Salesforce.xml
app/locale/en_US/TNW_Salesforce.csv
app/locale/en_US/template/email/tnw_salesforce
js/tnw-salesforce
lib/Salesforce
powersync/import.php
powersync/sf-sync.php
skin/adminhtml/default/default/images/preloader-sm.gif
skin/adminhtml/default/default/images/sf-logo.png
js/lib/jquery/jquery-1.10.2.min.js
js/lib/jquery/noconflict.js
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