Many products could be affected. For instance, while the government has said it will not allow chlorinated chicken, meat can be washed in a variety of other substances that have similar effects: peracetic acid, cetylpyridinium chloride, acidified sodium chlorite, or organic acid rinses.
https://www.theguardian.com/environment/2021/jan/19/uk-ministers-gain-power-to-allow-lower-standard-food-imports
mmmm... tasty.