Destroying Textures/Texture2D in the right way!

Hi everybody, today in my work i have an issue where the app we are developing crashes. The application is a drawing app where lots of textures are created, cloning etc.
The problem is that when i generate random screens (with objects to paint) the memory starts growing in the device (Android-iOS).
I've been reading a lot about how to destroy textures but i have differents behaviours, so it would be nice to have the point of another developer.

I read that we have to do some of these things:
Texture.Destroy(myTexture);
Resources.UnloadUnusedAssets();
Destroy(renderer.material)

And what i've tried was doing the Texture.Destroy of each variable when i will not using it again and after that calling Resources.UnloadUnusedAssets();
Is expensive calling Resources.UnloadUnusedAssets()?
Should i call it after the destruction of each texture?

I would like to clean up the memory and not leave any texture living in memory.

Thanks!

 

Just call it once when you're done destroying everything.

--Eric

 

You mean, i have to destroy the textures and in the end of destroying all i call resources?

 

Yes.

--Eric

 

Eric, do you have any book or blog or anything relative with RAM and Unity (how it works), i mean, if i do a new() what happen, and when you do a destroy, etc etc.?

And thanks for the answer