What happened when you tried it?
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Chip Pearson has a very nice addin that will help determine what that
character(s) is:
http://www.cpearson.com/excel/CellView.htm
Since you do see a box, then you can either fix it via a helper cell or a macro:
=substitute(a1,char(13),"")
or
=substitute(a1,char(13)," ")
Replace 13 with the ASCII value you see in Chip's addin.
Or you could use a macro (after using Chip's CellView addin):
Option Explicit
Sub cleanEmUp()
Dim myBadChars As Variant
Dim myGoodChars As Variant
Dim iCtr As Long
myBadChars = Array(Chr(10), Chr(13)) '<--What showed up in CellView?
myGoodChars = Array(" ","") '<--what's the new character, "" for nothing?
If UBound(myGoodChars) <> UBound(myBadChars) Then
MsgBox "Design error!"
Exit Sub
End If
For iCtr = LBound(myBadChars) To UBound(myBadChars)
ActiveSheet.Cells.Replace What:=myBadChars(iCtr), _
Replacement:=myGoodChars(iCtr), _
LookAt:=xlPart, SearchOrder:=xlByRows, _
MatchCase:=False
Next iCtr
End Sub
If you're new to macros, you may want to read David McRitchie's intro at:
http://www.mvps.org/dmcritchie/excel/getstarted.htm