Usually there are two major problems with Mac optimizers: they are either pretty expensive (especially those that have a subscription-based model) or their free versions are either limited in features or they restrict how much of your junk data you can clean before you’re asked for money. Advanced Mac Cleaner falls into the latter category with a major difference: here you can do nothing other than make scans with the free version, albeit as many time as you want.
However, if you do decide to purchase a license for the software you will also be entitled to a money back guarantee: pay $39.95 for the initial six month-long subscription period and cancel the subscription within 60 days from purchase if you are not satisfied.