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What are the top things to look for when deciding whether a coin has been cleaned or not?

Hairline scratches in fields or on devices or the areas that look like they have been rubbed/scrubbed. Easy to see under magnification. Devices may have dirt or grime around them while the rest of the coin looks clean. Coins that have been dipped too long may have a dull appearance. Or the coin looks like someone took a silver polishing cloth to it and shined it up until it burns your retinas.

Thank you that was really helpful looking at some of my coins.

It also helps if the details seem very flat yet has a sheen to it.