Please provide us more details regarding you problem.
Are you using or created any add-on for that specific data source? What do you mean "not parsing correctly"? can you provide examples of the "junk"? What input mechanism are you using? (File monitor, udp/tcp inputs, etc)
------------ Hope I was able to help you. If so, an upvote would be appreciated.
Thank u for your reply. The McAfee data has the following problems. It looks like the format is wrong, for example quotation marks are ", and less than symbol is <. In addition, data seem to wrap across multiple log events. Please advise & Thank u