Just a thought .... Could those of you who currently have the problem, re not being able to clean amazon files, please volunteer to test Apprentice Harper's 'fix' when he initially releases it. Perhaps you could post your intention on Alf, or else on his github site.
As apprentice Harper doesn't have a mac it would be especially convenient if the mac version were 'road tested' prior to general release.
One could also PM ApprenticeHarper on MR and alert him to your willingness to be a tester as well.