I look at it from 50' and get it- been going to Canada every year for 45 years and had it every year.
Prednisone works quickly but it is a steroid. Use only if you're covered head to toe.
Bleach- not good for your skin- it can cause first degree burns if used too often. Swimming in a chlorinated pool has same effect.
Anivy, Ivydry, calamine, caladryl are all drying agents and are effective for small areas only.
If you're allergic as I am to the stuff, the prescription ointments work very well, and are a good option to doing the steroid treatment (I have had violent migraines from prednisone)
The ones I take with me to Canada are Cutivate and Betamethasone. Both knock it out in a hurry.
Molson and benadryl cure the other symptoms.