How do you sterilize a gallon bucket?
Like if you're making pickles or flavored wines?
Bleach and water or you can purchase a commercial product from a restaurant supply store or a store that sells commercial cleaning products.
If the container is stainless steel, you should use a product like One Step. It's environmentally friendly and doesn't require rinsing, but I always do. Available at home brew shops.
See the selections available below. I'm not sure which one I've purchased from them in the past- the store is right near me and the clerks are very helpful, I just bought what they recommended.
This is a great place for beer/wine/cheesemaking supplies, BTW. If you're not sure what to get, they are very helpful, even over the phone.