I have been taking a look at this too.
Seems most of the feedback I have had so far shows that many of my customers would welcome the service.
For me, it's all about offering an extra service to tag onto my current business.
Because, once I have done a whole house in blinds they don't need me again until they move or change their mind ( rare ) .
The formula is right as I already have a large and growing customer base I can mailshot, nobody else near is offering it !
I could even include it as an upgrade on purchase for me to return after x months to clean them !
Main problem I see is that the machines are bulky and very costly to buy.
Having my own premises could mean a problem as running costs so far are tiny.
P.