Flush Front Frame Rails

I can grab a pic laterz but below where the battery goes and below the air box area, under the fender aprons. I'm sure I'll get most of it with air or a pressure washer, just didn't know if there was a better way.
 
You can see the stray bolt
 

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The bolt is not the concern, but the random crud. I started with a air house and got a lot. I just want it clean enough to spray some rust converter in there