MacBook got wet. Performance issues

[RoadGhost400 0]

Hoping for some good advice.

My daughters MacBook Air got OJ spilled on keyboard and stopped working.  Sent it back to BestBuy who said it needed a complete rebuild.  When they returned the Mac it surprising started to work.   I had reinstalled Office and it limped along.  Keys are a little sticky but work.  The issue is that it is very slow and I don't know if there are any utilities that can resolve or if a small amount of work is needed on hardware - I do not want to pay for a rebuild as it costs more than buying new.  Below are my NovaBench results.  Grateful for any advice you can offer.

MacBook Air (MacBookAir6,2)
Intel Core i5 @ 1400 MHz
4 GB - DDR3 @ 1600 MHz
Intel HD Graphics 5000

NovaBench Score: 151

2015-12-12 22:26:27 +0000
Mac OS X 10.10.2
Intel Core i5 @ 1400 MHz
Graphics Card: Intel HD Graphics 5000

4096 MB System Ram (Score: 97)
- RAM Speed: 567 MB/s

CPU Test (Score: 30)
- Floating Point Operations/Second: 9762192
- Integer Operations/Second: 18393768
- MD5 Hashes Calculated/Second: 73828

Graphics Test (Score: 15)
- 3D Frames Per Second: 37

Hardware Test (Score: 9)
- Primary Partition Capacity:  11 GB
- Drive Write Speed: 22 MB/s

 

[NickPick528 4]

Hi RoadGhost,

I don't know much about MacBooks, but that is a terrible score for that system. Literally everything is extremely underperforming. And is the hard drive really only 11gb? The only thing I can think of is to just get it replaced by apple. unless Nathan (who should be replying soon) has any suggestions otherwise, I;d just get it replaced. Because if Bestbuy cleaned it out and rebuilt it, I don't have any idea what could be wrong with it. Sorry.

[Nathan 73]

Yeah, that's nowhere near the score you should get

If you can, take it to an Apple Store. They'll be able to run a better diagnostic at the genius bar.