I'm new to ArtRage and have plunged right in with both the Windows and Android versions. What a wonderful tool! On the mobile version, however, I cannot seem to find a "clean brush" option while using oil brushes. On Windows, when "auto-clean" is off, a cup appears for cleaning the brush. I don't see any similar cup on Android. Am I missing it somehow or is there another way to clean? Thanks in advance for the help.