You need to use protection on a regular basis on the gaskets that run along the body/ panel joints.
I use this
http://www.acf-50.co.uk

I'm on 50,000 plus miles on a 2009 sport. In winter when the salt goes down I have the Hose attachment on spray and rinse down every use, I have car ramps permanently out, to pull up so I get under side as well as on top. and then into the garage she sits over a electric tube green house heater and a cover.

Cain

Wolf Cafe Racer
4/4 Sport