To do it well takes patience.
The first step is using a heat gun (or if you live in a hot climate - just leave it out in the sun in the afternoon).
You need to get the adhesive under the badges nice and warm.
Be careful here - if the car is metal you're probably OK. If it's plastic under the letters you need to really watch the heat to make sure it's no warmer than you get in the hot sun. Just use your bare hands and feel around - don't melt your car.
Some sites and videos say to use fishing line or dental floss - fishing line works better. You get the adhesive under the badge nice and hot - then you run the fishing line behind the badge cutting through the warm adhesive like a hot knife through butter.
I have found, however, that most of the time I have not even needed the fishing line.
Almost always - once the adhesive is hot, you can just kind of wiggle and pry. They'll usually just kind of peel or twist off. If you do this be careful that you are not prying on one side of a letter and making the other side dig in to the paint causing scratches.
Never use any metal utensils. I have used some plastic like paint scraper types of things to help pry - but always very very carefully.
Once you get the letter off the real work begins to remove the adhesive.
Don't use scrapers or most chemicals. They hurt the paint.
I found a cleaner/polish that I use on my motorcycles - and it's brilliant. It's called "Plexus". It really eats up the adhesives, making them ball up like poster tacky...
I spray that on the remaining adhesive and let it soak a few minutes - then using micro-fiber cloths rub off the adhesives.
This takes a while, and you have to press really hard usually.
Because you need to be pressing and rubbing - a few things are very important:
1. Only use micro-fiber. Cotton or other materials scratch paint.
2. Keep the surface lubricated with the plexus. This helps the adhesive ball-up, and prevents scratching.
3. If the cloth becomes clogged with chunks of adhesive - switch to a new cleaner rag.
Basically using some good old fashion "elbow grease" (pressing hard) and the Plexus cleaner - I just work the adhesive off the car with no scratching.
Many methods you find on the net assume lots of scratching and a need to buff out the paint afterwards. I have never needed to repair any paint, and have de-badged several vehicles.
But it takes patience, and have to follow the "rules" about the cloths and cleaner.
For the Winnebago it took a long time because there were so many letters...
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