> 1. For people who use some kind of a cleaning service, the cleaners usually bring their own vacuum cleaner. In this case the owner might be unable to send you

> 1. For people who use some kind of a cleaning service, the cleaners usually bring their own vacuum cleaner. In this case the owner might be unable to send you the dust. Would be interesting to look into what fraction of your target audience falls under this category. This could actually be a feature. Sell to the CLEANING services, have them offer your service as an add-on package so that people who have their apartments cleaned (e.g. people with disposable income) can find out what exactly is being cleaned up and what additional measures may be needed.