Get rid of "ipa" files in the trash

I had recently backed-up both my ipad & iphone using iTunes 12.0.5. When I went to my desktop (Yosemite 10.10.3), to empty the trash, it seemed to stall on the "ipa" files. I took all the files out of the Trash and place one in, then empty the trash. This worked for all files except the "ipa" files.Everytime it was an "ipa" file, it would start to empty the file, then the "progress" seemed to stop. It may start out with 4 files, then go to 2 files, then stay on the 2 files. I have timed it for over 10 minutes and it 'll still be stuck on showing 2 files to eliminate.How can I get rid of them?