Viewfinder Cleaning - 7D

I would like to clean the viewfinder of my Canon EOS 7D (just the glass where I put my eye on). There has been accumulate salt since my last atemt to shoot next to the see during a windy day! How should I do it, not to damage the glass?

Thanks!

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Canon EOS 7D | Canon EF-S 15-85mm IS USM | Canon EF 70-300 IS USM | Hoya HD UV filters | Manfrotto 055XPROB + Manfrotto 804 RC2 | Sandisc Extreme 16GB CF | RS-80N3 (non-genuine) | Lowepro Nova 190 AW