You can uninstall the Application Client using Installation Manager response files.
Read Installing the Application Client using response files for more information:
Using Installation Manager, you can work with response files to uninstall the Application Client in a variety of ways. You can record a response file using the GUI as described in the following procedure, or you can generate a new response file by hand or by taking an example and modifying it.
<?xml version="1.0" encoding="UTF-8"?>
<agent-input clean='true' temporary='true'>
<uninstall modify='false'>
<offering id='com.ibm.websphere.APPCLIENT.v85'
profile='Application Client for IBM WebSphere Application Server V8.5'
features='javaee.thinclient.core.feature,javaruntime,developerkit,samples,standalonethinclient.resourceadapter.runtime,embeddablecontainer'/>
</uninstall>
<profile id='Application Client for IBM WebSphere Application Server V8.5'
installLocation='C:\Program Files\IBM\WebSphere\AppClient'>
<data key='eclipseLocation' value='C:\Program Files\IBM\WebSphere\AppClient'/>
<data key='user.import.profile' value='false'/>
<data key='user.select.64bit.image,com.ibm.websphere.APPCLIENT.v85' value='false'/>
<data key='user.appclient.serverHostname' value='localhost'/>
<data key='user.appclient.serverPort' value='2809'/>
<data key='cic.selector.nl' value='en'/>
</profile>
</agent-input>