Jon,

MacIssues has a discussion on this topic that may be worth your review.

FWIW, I use Permanent Eraser (freeware) and strongly endorse it. There are four erasing/deleting levels:
Simple: 1X
DoE: 3X
DoD: 7X
Gutman: 35X


Harv
27" i7 iMac (10.13.6), iPhone Xs Max (12.1)

Those who can make you believe absurdities can make you commit atrocities. ~Voltaire