Product review (5 stars): highly recommend hooking it up to a power drill
We bought two of them to link together (cheaper than buying the extension, inexplicably) and it worked really well. You can use it manually and make progress, but I highly, highly recommend hooking it up to a power drill. It's simple and it makes the cleaning process much faster. Not much else to say about it. Decent quality product, feel like you could use it a hundred times without needing a replacement.