Appscleaner.com pop-ups appear when your Mac is infected with certain adware. The purpose of all adware is to trick you wasting your money, without rendering any decent products or services. Sometimes adware is in charge or producing various intrusive pop-up ads leading to dangerous web sites. In many cases adware uses scary techniques to trick users through fake technical support or custom service pop-up scam. Fake alerts from appscleaner.com web site are the example of such scam.