How do you clean a flak?

It takes 12 hours to clean the windows of a certain office building. During the first day of cleaning, the workers were able to clean for 9 hours. If the variable t stands for the amount of time the...

If it is you mean, it's clean by tidying things then you can't.If you mean, it's clean by cleanliness then tidy it up.And Vice-Versa.

Just wondering..... what is "it"?

You first use this powder they sell it at almost all stores they have Arm and Hammer rug cleaner you sprinke it on vacume it and then you take a housholder steam mop and steam it if you do not have a...

If you mean it's white when it's dirty, I would say it's a blackboard. If you mean it like you wrote it though, I would say it's a zebra.