Caution : Use at your own risk, because this is NOT supported by SAP.
dbcc cachedataremove (dbname, tablename)
If whole database is bound the cache, this approach may not help.
Next query for that table will start loading it back into the cache.
Safer approach
===========
Unbind the database from cache.
Drop the "garbage" table(s)
Bind the database to cache
Avinash