We have a large amount of 301s/canonicals on our site which aren't actually needed, just had people be lazy since we've automatically removed .aspx with a load of old urls with .aspx etc. So we have a lot of canonicals/301s. I'm trying to put together a case to get a large amount of these fixed (really simple stuff to do, just don't have the access to do it).
I'm basically looking for a way of explaining the above to show why they aren't ideal.
EDIT: needs to be simple, I can explain the technical side, but can't think of a suitable way of explaining it simply.