I just cleaned mine for the first time. I didn't know how long to go before cleaning the chain or anything else. I have 200 miles on it and my word, it was an absolute mess!
I have a bowl in the garage with a quarter inch of greasy grime in it now just from the chain.When I rode it after cleaning and lubing everything, I was shocked at how quiet it is now. It wasn't exactly noisy, but I am shocked at the difference.
For the record, I mostly ride hard packed dirt roads. I will definitely give the chain a quick wipedown every couple of rides from now on. Speaking/of which, it will be getting a wipe tomorrow.