Duck eggs- not sure how old they are!!

[cheezenkwackers]

They're pretty dirty so I can't tell for sure, can I wash them off with warm water so I can tell better?

Not a good idea. The shell is permeable and they are breathing through it, if they are alive.

 

[New duck mommy 2021]

They're pretty dirty so I can't tell for sure, can I wash them off with warm water so I can tell better?

No
Best not to wash them
That can lead to bacteria getting in