How can i make metallic reflection?

I need metallic reflection on car bodies, glass and other objects in my game world. I tried faking reflection with cubemaps, but they dont work most of the time, especially in car bodies and glass.

What’s the best way to make reflection. On transparent and opaque surfaces. Cars look plastic without a good reflection. It doesnt have to be real reflection, just something that can make it seem it’s reflecting the surrounding.

Please help.

Have you already used Reflective/Bumped shaders? (for metallic objects)
And for the glass you can try to search on the forum ( like this ).
(for all this things there are a lot of assets, like this)

Take a look at these: