Labug, if knowing all his stuff is in there is somehow preventing you from finding peace, then by all means ask him to remove it (except for the canoe -- I'd sell that and buy a kayak, but that's just me).
I can tell you if W moved out and left her clothes in the closets and drawers, that would eventually bother me and I'd want them gone -- I don't need that reminder around you know?
If you can get in touch with your real feelings on the matter and what it comes down to is that having his "stuff" there bothers you, then tell him to clear it out by [the end of April] at his convenience, just let you know when he's coming.
Accuray
Married 18, Together 20, Now Divorced M: 48, W: 50, D: 18, S: 16, D: 12 Bomb Dropped (EA, D): 7/13/11 Start Reconcile: 8/15/11 Bomb Dropped (EA, D): 5/1/2014 (Divorced) In a New Relationship: 3/2015