Deglaze the pan while it is still hot, I mean adding warm water (don't put cold water in a hot pan or it will warp). That will loosen up the stuck on food, the brown and black bits from searing. Then you should be able to clean it with a dish brush and some liquid soap like Dawn. I also highly recommend making a paste of water and Bar Keeper's Friend or Comet powder if you want to polish them back to looking like new.

I don't know why you got downvoted for simply asking a question. Take my upvote for being curious about how to properly care for your purchases. 🙂