How do I clean off this coin?

When cleaning out our basement I found some coin (I think its british based on the coat of arms thing) thats really dirty. Its probably nickel plated. What kind of acid/cleaning solution should i soak it in to clean off all the crap off of it without damaging the coin? And whats a good solution for doing the same with a canadian dollar (bronze plated)?

BTW they arent rare/uber valuable coins, and I’m not a real coin collector. I just wanna see what it is and where its from.

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