Clean out the lean to? That's a dirt floor and yeah that is wasted hay as bedding out there. I pick it when they poop in it, but other than that, why clean it out? Fire? I don't really see why.... there is no electrical in the lean to except that light overhead which is on the dead circuit.
I remember a post a while back about being careful about smoldering. If something was indeed smoldering, the hay would catch fire fast. And for some reason, I thought that short was very near the barn, so if there ended up being sparks,or something got hot, it could be a fire hazard. But again, I have no clue about layout. :-)