Smoke Damage

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Hello All, 

Recently purchased our first house that we are flipping, and there was small fire that was isolated to the kitchen and did not affect any of the house structure, which was confirmed by an inspector who said there were no signs of any fire damage in the kitchen or the attic. The issue we have now though, is that it does seem that the smoke got into the attic and the beams are showing smoke coloration (see pics). The previous owner tried to paint over it in white, but it is still quite obvious. Are there any recommendations on how to fix this so we don't have any issues when selling? Our contractor is recommended a radiant barrier so that all of the discoloration from the smoke is gone. 

Thanks in advance for any help.