How can I remove a burn mark/stain from a white countertop?

Hello T! I am not sure what you have already tried. I did include 2 links for suggestions. You may have already removed as much of the burn/stain as you can and you are left with a faint stain that is just there. If your countertop is laminate you could try a paste of baking soda and a bit of bleach--it may lighten the stain a bit more.

https://homeguides.sfgate.com/fix-burnt-laminate-countertop-27159.html

https://removeandreplace.com/2013/10/16/fix-remove-laminate-countertop-burns-scratches

How to Remove Stains from Every Single Type of Countertop https://www.purewow.com/home/how-to-remove-countertop-stains

Try some white toothpaste and a damp toothbrush. A dab of toothpaste on the brush. Let it foam up while brushing. A paste of baking soda and hydrogen peroxide may bleach it a little. Apply the paste and cover with plastic wrap. Let it dry, wipe off.

You can paint the entire counter. You just need to get the correct paint that will stick to the laminate.

For incredibly tough stains, leave the baking soda paste (baking soda and water) on the stainovernight and wipe off in the morning. Another option for removing stains is to rub the spot with a cotton ball moistened with bleach. Rinse and dry.

If it is truly burned I think you will have to buy a giani or rustoleum kit and paint the counter top. Or you can follow Diane's tutorial on In My Own Style on how to paint the countertop https://inmyownstyle.com/kitchen-counter-transformation.html

I have found that fresh lemon juice can bleach out difficult counter stains, it removed my hair color from the vanity which is a pale yellow.

Hello, you can paint the countertop the same color or a different one to improve the look, I did mine and it lasted 10 years until I could replace them!

Lightly sand to rough the countertop up

Go to your paint store, tell them what you are painting, they will pick the proper paint and primer for you, you can even get the primer tinted for a better coverage

Once you have sanded, clean with TSP, then rinse and dry thoroughly,

Apply your primer coat, let it dry according to the instructions

Once the primer coat is dry, apply your paint coat, I would apply 2 or 3 as it will be stronger and thicker

Once your coats dry, you can apply a matte clear coat, either by spry or roll on, keep a small container of it under your sink for touch ups, I had my counters like this for 12 years, until I could afford new ones.

I used a few uncolored glass cutting boards for protection. It held up very well. And only costs you the prices of the materials.

Good luck!

Have you tried bleaching it out with a cloth soaked in bleach or try comet on a sponge with a scrubby that might work

Here's a post that might help - http://www.howtocleanstuff.net/how-to-remove-burn-marks-from-countertops/