my question is a little silly.recently i bought a 5870 fot my pc.during putting the board on slot i PERSPIRATION on my hand and the edge of board got a little wet.after for days of playing games such as crysis i still see the spot of that on board.is my vga still dry?has it been damaged?can it get damaged in long term?
What you are seeing is grease from your hand, not water residue.
To remove it use pure alcohol such as surgical spirit or iospropyl alcohol ( IPA ).
Moisten a paper towel and dab it onto the effected area until the contamination is removed.
If your hands are naturally damp, wear rubber gloves, like the surgical spirit, they can be found at a chemist (drug store), often called surgical gloves.