How do I find out when the last time I performed a cleaning was?

Moderator having the last word occured above

No more baiting please, just discuss and respect other opinions.

Thus since the baiting, and all-out uncivil behavior,did not end I've closed this thread.

To the Original Poster: the developers do read all suggestions and take each one into consideration

My Opinion: because of the fact that event logs are a cleanable item via ccleaner, and the idea behind ccleaner is to not leave behind any junk (including error logs) that this is unlikly to be put into action, that said anything is possible and the above statement about the developers stands so it may happen.

(Last word in this thread is thread)