Hoover SmartWash Carpet Cleaner 1 Hour of Relaxing Sound. Hoover sent us this SmartWash Carpet Cleaner to try out and see and hear how it performs. This carpet cleaner produces a great sound combination with the light spray of water combined with the vacuum sound. If performs great to actually clean the carpet too. Simple to use, it had my carpet looking noticeably cleaner after the first use. Enjoy the sound of this carpet cleaner. Like the vacuum cleaner sound, many people find this sound to be helpful for relaxation, ASMR triggers, helping induce sleep, or soothing a fussy baby. Let us know what you think in the comments!