Below script can be used to find and drop the orphan users in a Database
Below script will list all the Orphan Users in a DB, we can
select the output of [Script_To_Drop_User] column of the table variable and execute the same to Drop the user.
-- Change the DB as per your DB Name
Use [PubDB]
declare @tbl_orpusers table (name varchar(260),[sid] varchar(100))
insert @tbl_orpusers
exec sp_change_users_login 'report'
select name [Orphan User],'DROP USER ['+name+']' [Script_To_Drop_User]from @tbl_orpusers
Checking the Orphan Users:
Below Link can be used to work on Orphan users in a DB,