Bad smell in washroom, something burning?

ok im a teenager...and we all have our pyro moments whn we gotta do something stupid with fire...anywayzzzz if anyone noticed that tag/axe body spray + flame = flamethrower then keep reading. so i was in my washroom...and i sprayed some tag in the sink...lite the little spray spot of fire:P then sprayed more tag and it made a huge flame that did went all around the sink...pretty cool right?=P so on the back of the sink theres a opening...so that if the sink over flows the water will drain in there...and inside their ...is kinda mouldy/rusted/ i dun wanna no. big surprise the flame got inside there...and i saw a bit of smoke comming out. i blew it out poured tons of water and w.e in there. its been 2 days and my washroom now has this stale smell to it. so i guess the like mold caught on fire...and the smell wont go away. ive opened windows and even poured baking soda down there to absorb the smell. so anyone no y this smell is still here after 2 days...any help is appreciated. THANKS=D