Generally door knocking is the fastest way to grow a customer base,
However, I'm not sure whether this is such a good approach for domestic cleaning where you are working inside people's home ( potential customers )
We set up the mother in law and did leaflet drops which got more response than we get from window cleaning flyers, but ad's in the local parish mags and post office windows worked really well, it's a bit of a slow burn but everyone she got this way are still regular clients nearly 3 years later
Hope this helps
Darran