I know how to clean your friend's buildings for the new achievement just recently added but how often does the cleaning brush appear? is it time based?

  • @Juan That question asks how to do it, this asks how often it can be done. I don't see that mentioned in the other question at all. – bwarner Jul 25 '11 at 22:13
  • Sorry, I misread – juan Jul 25 '11 at 22:18

It is time based. There is a maximum number of cleanings per day based on your level. After cleaning this many times, you have to wait 24 hours until you can clean their buildings again.

  • Thanks for answering a tough question. Do you know how to determine the maximum number based on your level? That would be useful to add. – bwarner Aug 9 '11 at 19:02

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