For the rust, brodgar is right about cleaning off as much as you can first, but to then stabilise it I recommend Dinitrol 3125. A great product in cavities and on surfaces such as you describe.
http://www.dinitrol.co.uk/rust_preve..._and_oils.aspx
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2003 V70 2.4T SE | Owned from new | M56 | Bilstein B4 | Nivomats | BSR PPC | Ferrita Exhaust | Poly small bush in lower torque mount
2008 C30 T5 SE Sport R-Design | Dynaudio | BLIS | Winter Pack | Towbar | Parking Control | Keyless | 18" Atreus
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