While the suggestions made above work for many people, I would like to HIGHLY suggest that you don't keep these candles anywhere near the birds since they are very sensitive to these things. Just my $0.02.That is true! You have to be very careful things like teflon from frying pans, glade air freshners, I dont use any air freshners, smoke, no strong cleaners near the bird. Anything with a fume really. If you know its smelly look it up if its safe cause if could probably kill a bird.
you can use natural beeswax candles, and to freshen the house I use vanilla with water, you cam use baking soda and lemon juice in a container to soak up odur, and you can boil cinnamon, spices, and apple on the stove.
I know its hard but they bring so ,much joy into your life that it outweighs the negative ten fold