[MacDV] erasing miniDV tapes

[rgb at ellerbach.com]

Any recomendations for a non-camera (bulk) tape erasing tool? When I reuse
a tape in my Canon ZR60 it often doesn't overwrite the previously recorded
scenes fully; like the write-strength of the heads isn't enough if there
is already something recorded on the tape. Weird. But maybe if the tape
was fully erased by something better the tape could be used again? I've
got a number of tapes where the original material isn't worth
archiving/saving and it'd be really good if I could reliably use the tape
again.

Rich