I tried everything and it wasn't until I went to see the doc and he burnt them off with liquid nitrogen that they went for good..I think other methods are often either old wives tales or luck.They seem to work for some and not for others.
If using Wartner or similar you have to keep rubbing them with an emery board to get rid of the dead stuff before you apply it(urgh!) I tried that and it didn't work until the doc told be about the filing. He attacked one with liquid nitrogen and prescribed me salycilic acid which seems to be doing the trick. Our doc has a wart clinic so phone your practice and see if they have similar.