As with any other time, if you have a bad vaginal odour it's a sign of a problem such as a vaginal infection. Tampons are a major cause of vaginal infection, so if you accidentally left a tampon for two days then this increases your risk of infection. Chances are you have Bacterial Vaginosis, thus you need to go to your doctor for tests and treatment: they will give you antibiotics.
Yes, you would be able to feel if there was a tampon still within your vagina. If you suspect you may still have a tampon in place clean your hands and insert fingers vaginally to feel around the vaginal canal to check - your vaginal canal isn't that long so you should be able to reach easily, but if you do struggle try to squat and push down as if you were passing a bowel movement. If you can't tell if there is a tampon there then you should tell someone to ask for help or see your doctor.
1). Wash the inside with Lysol disinfectant. 2). Leave an open box of baking soda inside it for a few days.
Odor after sex is normal as vaginal pH is acidic whereas semen pH is more alkaline. If it goes away within a few days this is fine, if the odor persists then see your doctor.
Any fuel spill,storage or leak can cause fuel odor inside the car.
The odor was pent-up inside the house
Wasps nests themselves do not necessarily have an odor, however dead wasps trapped inside a nest will generate an unpleasant odor and attract other pests.
Picking your nose, causing bacteria to swarm inside.
A Leakage
No.
P-traps and s-traps have odor because of the standing water trapped inside of them. Things like food, sludge, and skin cells coat the inside of the pipes and grow bacteria which produce odor.
Only if you havent washed in two days
To remove cigarette odor from a book, place it in a plastic bag and sprinkle in some baking soda. Close the bag and allow it to sit for a few days. The odor should then be gone.