T-SQL forcefully delete a database involved in replication

dropdatabase.sql

--you should substitute 'dbname' with the database name you want to drop

use master
go
 
exec sp_helpreplicationdb 
exec sp_removedbreplication 'dbname'
 
ALTER DATABASE dbname SET SINGLE_USER WITH ROLLBACK IMMEDIATE 
ALTER DATABASE dbname SET MULTI_USER
 
DROP DATABASE dbname