How to Remove Oracle HTML DB on ORacle database Objects Schema?

This section describes:

How to remove the Oracle HTML DB schema, synonyms, and users 
from the database without deleting the database.

Open SQL*PLUS and connect as privileged user SYS as SYSDBA

sqlplus sys as sysdba

Execute the following commands:

 ALTER SESSION SET CURRENT_SCHEMA = flows_010500;
 EXEC wwv_flow_upgrade.drop_public_synonyms;
 ALTER SESSION SET CURRENT_SCHEMA = SYSTEM;
 DROP USER flows_010500 CASCADE;
 DROP USER flows_files CASCADE;
 DROP USER htmldb_public_user CASCADE;

and done!!!