Traditional oven cleaner is lye, it chemically turns the baked on fat and oil to soap. This soap then helps clean off the other baked on stuff.
I don't know (yet) how the new lye free oven cleaners work.
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The use of oven cleaner involves a chemical change. The active ingredients in the cleaner react with the residues in the oven to break them down into simpler substances, which can be wiped away.
It is a physical change, as the chemical integrity remains the same.
It is a physical reaction. Melting is a physical change because it does not change the chemical composition of the substance.
It is a physical process. Not really a change of any kind.
Physical changes
Using hot water to expand a metal cup is a physical change. The change in size and shape of the cup is due to the expansion of the metal atoms when heated, but the chemical composition of the metal cup remains the same.