I use it all the time in my GE frontloader ...
1. Wash whites as normal on a full wash cycle.
2. Run them through the short cycle wash. Instead of any detergent, bleach, etc., I simply mix up maybe a 1/2 teasp. of Mrs. Stewarts in a 1 quart jar of water and add it to the detergent slot AFTER the water has started filling the washer.
My whites have never looked better!