cannot delete Distribution database

I have been 'playing' setting up merge replication just so i can get a feel for what is going on, now I want to clean everything out and start afresh but I cannot remove the distributor I deleted the subscription and publication Ok.

I get

Could not drop the Distributor 'DELLDUO'. This Distributor has associated distribution databases.

and when I try to delete the database directly using drop  get

Cannot drop the database 'MPCDistribution' because it is being used for replication.

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jnc