"How to" clean MAF sensor

I took my truck through some thick mud last night. The whole night and part of the morning the truck ran great. It was after i washed underneath the hood the truck started bogging down and seemed to be misfiring. I had this problem on my old nissan and it was the MAF sensor which i replaced.
Could there be another possible issue? Upon start up the truck has a really rough idle, however The problem seems to correct itself after going 5 miles or so. Check engine light came on but i have yet to read the code. Thanks in advance for any help

 

Bump for same situation

 

Did you check to see if the air filter is wet?

 

Either way can anyone tell us how to clean a Maf?