Mattresses and sofas are inherently quite dirty as they are difficult to clean thoroughly, so I chose it when I saw this in my Vine queue. I didn't really notice that much dirt was thrown up on our mattress. But actually I also have two mattress pads under the fitted sheet. I have actually seen more dirt being pulled from our living room sofa which is constantly being spanked by our 3 year old daughter and older York. Cleaning and disassembling the filter is pretty easy and I love that there is a UV function. In order to really disinfect with UV light, however, you really have to expose the surface to the light for a few minutes. Therefore, it is not entirely practical as it would take more than an hour to effectively disinfect a mattress or sofa with this device.
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