No, you can't clear them out with a single line of code. You'll
have to loop through them. For example,
Sub ClearTextBoxes()
Dim OLEObj As OLEObject
For Each OLEObj In ActiveSheet.OLEObjects
If TypeOf OLEObj.Object Is msforms.TextBox Then
OLEObj.Object.Text = ""
End If
Next OLEObj
End Sub