This is praised for being a one-stop utility that removes defunct software and other pointless files while also scanning your machine for malware, managing extensions and checking for updates on your installed apps. Ukranian tech company MacPaw produces CleanMyMac X. Many questions float around the web regarding these kinds of cleaning apps - mainly because those who need an app to help with this process ( as it is possible to do manually if you have the know-how) are not techy-minded enough to be able to assess their validity. You can also buy a one time licence for £76.95.
If you have two Macs to sort, there's an even better deal at £49.95 (instead of £69.90) a year, which is a saving of £19.95 Normally priced at £34.95 for a one year subscription, the discounted price for a short time is £29.95. Right now there's a flash sale on one of the leading products, CleanMyMac X. Not to mention the myth that Macs can't get viruses or malware - when in fact they are simply less targeted by malicious software that their Windows counterparts.