Dim LR3 As Long, i3 As Long
With Sheets("Productos")
LR3 = Range("A" & Rows.Count).End(xlUp).Row
For i3 = LR3 To 2 Step -1
    If IsNumeric(Sheets("Productos").Range("A" & i3).Value) Then
    Else
    Rows(i3).Delete
    End If
Next i3
End With

Sub Sample()
    Dim LR3 As Long, i3 As Long

    With Sheets("Productos")
        LR3 = .Range("A" & .Rows.Count).End(xlUp).Row

        For i3 = LR3 To 2 Step -1
            If Not IsNumeric(.Range("A" & i3).Value) Then .Rows(i3).Delete
        Next i3
    End With
End Sub

Sub Sample()
    Dim LR3 As Long, i3 As Long

    With Sheets("Productos")
        LR3 = .Range("A" & .Rows.Count).End(xlUp).Row

        For i3 = LR3 To 2 Step -1
            If Not IsNumeric(.Range("A" & i3).Value) Or _
            .Range("A" & i3).Value = "" Then .Rows(i3).Delete
        Next i3
    End With
End Sub

Dim LR3 As Long, i3 As Long

With Sheets("Productos")
    LR3 = .Range("A" & .Rows.Count).End(xlUp).Row

    For i3 = LR3 To 2 Step -1
        If IsNumeric(.Range("A" & i3).Value) And _
        len(.Range("A" & i3).Value) > 0 Then

        Else
            .Rows(i3).Delete
        End If
    Next i3
End With