I have a really bad odor coming from a drain in my basemen and the smell is coming through the heater vents smelling up the whole house I tried everything from draining liquids to air freshners to covering the drain with a shirt I no its coming from their because I can clearly smell it directly from their I just had it snaked a week ago because it was backed up the snake did its job but the odor is still their PLEASE HELP ME I CAN'T TAKE IT NO MORE

For tonight just dump some cooking or vegetable oil into the drain, 2 cups should kill it for tonight. Yomorrow we can start trying to figure out why those drains are not keeping their water traps filled. I think that is what is happening in your case but I'll need more info tomorrow.