ive thought about this recently ian,
i would say yes, a second hit should be the same, or at least only minor changes that is for completly new areas to you, areas you done for years really does not matter, when i changed mine alot i had work on first hit in areas i done for years,
just delivered a completly new area i ve never done before (lots of leaflets) not a single call, as i expected. when i do it again i relised i might have changed my leafs again by then, so decided to keep some back just for this area, i just got a feeling for a good 2nd hit effect they should be the same.
i think they'll think oh another carpet cleaner and not relise its the same company.
regards craig.