As with most stickers, the best way to remove them is to use some heat. A heat gun (at a low setting) or a hair dryer on high heat should provide enough heat to soften the acrylic adhesive so that you can, at the very least, be able to remove the vinyl itself from the decal below it, whether it is last year’s reflective decal date tab or if you’re getting down to the plate itself.
Since a license plate is a combination of a thin aluminum plate and a reflective decal itself, the main issue is that if you apply too much heat, you may lift the reflective vinyl from the aluminum itself.
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