Has anyone used fuel additives for carbon deposit cleaning? Do they work well?

Should I clean the carbon deposits in my Kia Sportage manual transmission after 90,000 kilometers?

Has anyone used fuel additives for carbon deposit cleaning? Do they work well?

Fellow car owners, how do you clean carbon deposits from your car? Which brand of fuel additive works well? Any recommendations?

Does adding fuel additives really help clean carbon deposits? Is it a waste of money or truly effective? Let's discuss, fellow car enthusiasts.

How to Clean Carbon Deposits in Vitara

Has anyone here used fuel additives? Do they work?

Is there anyone who has replaced their Android screen? Does it work well?

Has anyone reprogrammed the transmission on a 2014 Peugeot 3008? I'm considering it but worried it might not work well. How's the experience?

Has anyone used fuel additives?

Is there an automatic window lift module available online? Has anyone bought it, and does it work well?