When I should clean my carpet when its visibly dirty or clean?

I have no idea what you're talking about. Your title doesn't jive with your post. What do you want to know? When to clean your carpet? Whenever you want. Or do you want to know if your carpet is giving you allergies? How would we know? Go see your doctor.

anything moving in the knap?

what's 'knap'?

the k is silent like the p in swimming pool

Many think the Ks in Knurled Knob are silent.

I think it's all about warp.

There is no 'K' in warp.

ok, how about woof?

Carpets contain chemicals as well as the material they used to make the carpet.

Clean carpets regularly, and before you can visibly see dirty spots on it. We don't wear shoes in our house, but I still clean the carpets at least once-a-month in the high traffic areas. Cleaning your carpets regularly should also minimize the allergy symptoms you may be experiencing.

I run the iRobot in our bedroom at least 2X's a week.

OK