"BUT on my newer stand alone PC circa 2009 it finds some 158 items and sweeps (cleans) only 148 of them. Is this right ?"
I would say probably yes, because a number of these 'cleaning' programmes are working on similar styles, expecting the user to uprate to a 'paid for' version of the programme.
A second sweep will most likely clear any so called problems!.
If you use another similar type 'cleaning', programme, you may well find that the alternative will find or not find things that EasyCleaner did.
A review on EasyCleaner click here