That's what I just said.
Is there any reason to use the input cleaner instead of just performing the checks yourself as I suggested? The advantage that way is that you don't have to change the way you access the variable and you can also assign extra or different checks instead of being limited to the few GPCs and can assign if/else to deal with the data as well. That's a terrific tutorial but the one thing it doesn't do is explain why you should use it instead of your own way.