1928 Canada 5 cents- $0.65 in F, $2.75 in VF
1938 UK 1 penny- $0.20 in F, $0.50 in VF
1912 France 5 centimes- $0.25 in F, $0.75 in VF
1916 France 5 centimes- $0.25 in F
1909 Kiau Chau 10 cents- $30 in F, $50 in F
As far as cleaning, the Canadian I would leave alone, the coppers I would take a small toothpick on (they are worth little anyway). For the Kiau Chau, are you selling it or planning to keep it for your life? For selling it, I would leave it. Otherwise, I would put it in vinegar, and it would remove the red and expose the copper-nickel under. However, the red might be hiding extreme pitting under that reduces the value to zero, like my Indian 4 annas. My philosophy is that the coin will only get worse without treatment. Since the vinegar is not 100% safe, I would only do it if the coin was not planning to be sold.