Cannot remove specific polygons

Question

Here is my first model

I cannot figure it out how to remove "ears". I made something and these polys/edges/vertices become unselectable but still visible in object mode

I just want to remove them to remake it completely

UPD Here is how my model looks in solid shading

And when I select all via A

Answer 1

Sorry for noob question
Problem solved, I have made something definitely wrong :)