Looks like flood damage.
But I don't get it, man, it just looks dirty to me? Like a car does after a week of rain.
I'd take it. A nice scrubbing with some degreaser and a terry cloth will probably make it look good as new. You know what you should do is bring over a terry cloth and some detail spray... give it some passes with that and if it cleans up good, you know it's worth it. 'Cause like I said it just looks dirty to me.
How much of a deal is it, exactly??