BastyPutt
Yes, your Polish is a cockerel...
You basically just submerge them to the base of their neck - we use a 5 gallon bucket.How deep is the water for a good soaking ? I clean their feet and check for leg mites and bumble foot every few weeks. But never soaked beyond the feet
The Epsom baths are great, but in a case like this with a chicken that is probably really physically weak, it may not be the best idea. Especially if they have never had one. If you did do it, you'd want to use a hair dryer and make sure to dry them out so they don't exert too much energy or get chilled.