I fund some empty pool's i can't delete them, so here you go mystery cleaning fairy
http://www.e621.net/pool/show/743
http://www.e621.net/pool/show/418
http://www.e621.net/pool/show/441
http://www.e621.net/pool/show/671
http://www.e621.net/pool/show/53
http://www.e621.net/pool/show/622
http://www.e621.net/pool/show/417
http://www.e621.net/pool/show/474
http://www.e621.net/pool/show/709
Updated by Mario583