This is the best open-source (completely free) alternative to paid cleaners. It is "exclusive" in its thoroughness and doesn't require any license keys or subscriptions. CCleaner (Free Version):
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: Offers a one-click scan to remove junk files and improve PC performance. This is the best open-source (completely free) alternative
: Copy the license key from your confirmation email and paste it into the registration box. This is the best open-source (completely free) alternative