Weird smell from Honda Brio when I start the car/idle it/move the car a bit
So I usually move my car when I clean it. Since a few months, the running of my car has significantly reduced. However, I do clean the car every Sunday or so and I remove it from my driveway and park it back again. Lately, some weird smell has been coming from the car after I am done moving the car or after I idle the car for a few minutes. Not sure, but it seems it is unburnt fuel. I immediately checked the oil and it was full. Oil has also been replaced about 6-12 months ago and the filers have been replaced, too. This problem has surfaced recently and the smell is very putrid. What could this be?
Edit: No leakages.