I couldn't use magnets for my stickers on my last 2 cars. Here's another option to remove them.
Scrape off the corner of your sticker with the credit/debit card. Enough for you to grip with fingers. Spray WD-40 between the back of the sticker and bumper and pull slowly. Apply WD-40 as you pull it off.
Comes right off, no mess left behind, no paint comes off. Did this to my '02 and '09 cars. Both had painted plastic bumpers. No damage.
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