<P> A public version 1.10 for Mac OS X has been released along with a commercial Network Edition . Piriform also released CCleaner for Android in 2014 . </P> <P> The license for the free version has common terms against reverse engineering, copying and sub-licensing, and it disclaims warranties and liability . The Business and Professional licenses have a 30 - day warranty . </P> <P> CNET editors gave the application a rating of 5 / 5 stars, calling it a' must - have tool' . It was awarded Editor's Choice Award in April 2009 by CNET . </P> <P> In September 2017, CCleaner v5. 33 (32 - bit Windows) was compromised with the Floxif trojan that could install a backdoor enabling remote access of 2.27 million infected machines . Of these 2.27 million PCs, 40 received a second - stage payload that appears to have targeted technology companies such as Samsung, Intel and VMWare . On 13 September Piriform released CCleaner 5.34 and CCleaner Cloud 1.07. 3191 that do not contain the malicious code . </P>

What is ccleaner and how does it work