Could someone tell me why I cant rub out these lines please?

Hi All,
I have attached a copy of my model and I was wondering what I have to do to rub out these marked lines?
Please excuse my somewhat amateur arrows!

Thanks to all.clip test forum v2r .skp (149.7 KB)

Is this what you are trying to end up with? If so, the arc and horizontal lines are not in the same context and the rest of the edges. Explode everything down to loose geometry and you can erase them. Move your arrows away first or they will get in the way.

Dave, thanks so much!

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