ah sarcasm - you mean we can use sarcasm! why was I not told

on a more serious note:

Bob - I am a supporter of mac's white, I've also had it since way back when - and yes it could well be the best of the bunch for removing white.

Mehdi genuine has the advantage you are not limited to white - you can erase any single color value, but you need to adjust the settings to avoid 'fringe'