Who is doing Dryer Vent Cleaning?

I'm going to add it on, and would like to hear what you guys are using, and how you are going about it, also what to watch out for, and any other tips you care to share.
If you don't want to post it here, please feel free to pm me, or we can talk on the phone.
Whatever makes you comfortable.
It seems like a natural add on, and an easy sale.