If you were flagged by steemcleaner, then it means you must have done something wrong to warrant that.
Perhaps, plagiarized a content on Steemit.
If you haven't done any of such, then you can lay your complaint to steemcleaner so they help rectify the issue and if not found guilty, possibly remove the flag.
But if you are guilty of plagiarising, then there is pretty much nothing you can do about it other than avoid future occurrence and start writing original contents.