Talk:Cleaning/@comment-23833223-20130928021949/@comment-3991817-20130928104135

As far as I know the 'drop rate' is 100% when you have cleaned enough buildings on friends' islands. But I also understand that the number of buildings to be cleaned before the blueprint drops gets higher with every xp level. Maybe, if you are at a higher xp level than lvl7, you need to clean more buildings to get blueprint pieces.