Yes we scrape most everday....One of the true druges of the hobby
Kent makes this, get both a short one like this for more "grunt" and a longer handle one for harder to reach spots. If sure beats using a razor blade. They cost lest than 10 bucks at better shops and there are re-fill blades packs too. But the initial blade will last a very long time.........Glass only not for Aclyic.........And The "Mag-Float" is used every day too.
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They do make plastic versions for acrylic tanks. I bought one by mistake.
This one does take if off fairly effectively. I usually can scrape two tanks clean in about 20 minutes.