I had a pair very briefly in the 70s. They made such a mess. After that I swore I would never have ducks again.
Well here I am with not 2 but 8 of them. Nothing has changed. I live in the same house. They are in the same yard. What did change is my attitude. They are every bit as cruddy as they always were but I have a brick area I can hose off. The duck water runs into the garden as fertilizer and life is easier.
They will tame down eventually but you should start with a couple ducklings if you want friendly. They will show the wild ones you are safe.
How long have you had them? My first time lasted less than a week.