not if you want real dreads.
You can make "fake" dreads, though, and keep them clean.
Mind enlightening us on "fake" vs "real".
Dreads are matted hair. Yes, you can get dreads by not combing and not washing your hair. That is the "natural" way but you are also likely not to have good looking dreads. If that is "real" to you then sure, by your dumb definition, sure.
There are three primary methods of growing dreads.
Backcombing
Wool Sweater
Neglect
The first two methods can be done with clean hair. Neglect takes like 3 years to make dreads that look like dreads.
The first two can make dreads once your grow out your hair and dread it.
If you want the best looking dreads, you backcomb it because you have exact control over shape and size.....
Most people backcomb.