Chip Pearson has a very nice addin that can help identify those funny
characters.
http://www.cpearson.com/excel/CellView.htm
If you have to do this lots of times, I'd record a macro when you do an
Edit|Replace and modify it to do those funny characters:
Option Explicit
Sub cleanEmUp()
Dim myBadChars As Variant
Dim iCtr As Long
myBadChars = Array(Chr(10), Chr(13))
For iCtr = LBound(myBadChars) To UBound(myBadChars)
ActiveSheet.Cells.Replace What:=myBadChars(iCtr), Replacement:="", _
LookAt:=xlPart, SearchOrder:=xlByRows, MatchCase:=False
Next iCtr
End Sub
Just keep adding those Hex codes you found using Chip's addin.
(I changed the funny characters to "". You could use " " if you wanted a
space.)
If you're new to macros, you may want to read David McRitchie's intro at:
http://www.mvps.org/dmcritchie/excel/getstarted.htm