I use an empty orange juice container. Just cut the top off and use it as a scoop to get the ashes out of my UDS. I usually put a rag over the rim, so when I lean in I don't get the grease and crud all over my shirt. For my WSM, I just dump the ashes into a bucket, like most everyone else has suggested, and then bag them up and dump them in the trash. I keep all of my smokers in the garage, too, so I don't worry too much about ash clean up until the next cook.