I´ve downloaded the "Oracle De-install Utility (126.96.36.199.0) for Microsoft Windows (x64)", and run the deinstall command:
C:\Users\myuser\Documents\windows.x64_11203_deinstall\deinstall>deinstall -home C:\oracle\PRODUCT\11.2.0\Client_1
Everything goes ok but the oracle client remains in my machine.
You can try to remove your client by using below notes:
11.2: How to Manually Remove Oracle Server Software on Microsoft Windows Platforms [ID 1069034.1]
WIN: Manually Removing all Oracle Components on Microsoft Windows Platforms [ID 124353.1]