One poo too many

Really I need to evict the wren.  It would be ok if she just stayed in her roosting pocket and was shack trained.  However, she is always discovering new places to leave a little white surprise for me.  Today it was my heart shaped cushion that my Auntie gave me.  I've had to get rid of the chopping board, because she likes to decorate that most days.  So enough is enough.  The trouble is it's the wrong time of year for eviction of unhygenic wrens.  I don't know if she'd find another place to roost, and the blue tit has taken the nesting box.  I'm looking into buying some roosting pockets.