¿Por qué te estás lavando las manos? -Las tengo sucias.

[laepelba]

The answer to that question was: Me estoy lavando las manos porque las tengo sucias.

I am rather confused about the use of the first person for the verb "tener". It would have made more sense to me as: "Me estoy lavando las manos porque las tiene sucias."

I mean, obviously, "tengo" refers to the speaker who is washing his/her hands. But I don't understand why the hands "tengo" the dirtiness.

Also, would it be the same in the following examples??
- Me no estoy lavando las manos porque las tengo limpias.
- (Speaker looking at his/her own hands): "Las manos tengo sucias."

Please explain to me why first person is used here ... and some other examples would help! THANK YOU!!