Tutorial [Q] ARM to delvik revert back but storage still being consumed

I decided to try the ARM which comes as an option in Kitkat
But it consumes almost 500 MB over the space already being used up in delvik.
My phone has only 2 GB of internal storage.
On reverting back to delvik, 100 MB is still unaccounted for.
Is it possible that it is being cached up somewhere in the phone memory that I can free up.
Did any of you face anything similar?
Any help is appreciated.