I've never gotten Char(13) to behave nicely in the Edit|Replace dialog.
Saved from a previous post:
Chip Pearson has an addin that can help you find out what is exactly in that
cell.
http://www.cpearson.com/excel/CellView.htm
If it turns out to be "nice", you can use Edit|Replace
what: alt-xxxx (use the numbers on the number keypad--not above the
QWERTY keys)
with: (spacebar) or whatever you want.
This can work nicely with alt-enters (alt-0010), but will fail with other
characters (alt-0013 for example).
You could use a macro to clean them up:
Option Explicit
Sub cleanEmUp()
Dim myBadChars As Variant
Dim iCtr As Long
myBadChars = Array(Chr(yy), Chr(zz))
For iCtr = LBound(myBadChars) To UBound(myBadChars)
ActiveSheet.Cells.Replace What:=myBadChars(iCtr), Replacement:=" ", _
LookAt:=xlPart, SearchOrder:=xlByRows, MatchCase:=False
Next iCtr
End Sub
Change the yy/zz to what Chip shows (and you can drop ", chr(zz)" if you only
have one offending character).
(And I changed them to space characters.)
If you're new to macros, you may want to read David McRitchie's intro at:
http://www.mvps.org/dmcritchie/excel/getstarted.htm