absolutely no cleaning products around them, not in the same room anyway, and if you are using them in other rooms be very very careful and ventilate the house well.
NO CANDLES enless they are soy, the parafin wax is very toxic to them.
no insense and none of those plug in air fresheners or air fresheners of any kind really, spray or other wise and no febreeze in their room.
i know that sounds horrible. but there are non toxic alternatives.
soy candles cost the same and actualy smell better, target has a good selection of soy candles, if it is soy it will say so on the label, if it doesnt say then it isnt soy.
also target has a brand of cleaning products called 'method' that are non toxic and i use those, they also make air freshener sprays and disks to set around the house and i use those as well, they smell fantastic.
also check whole foods if you have one near you, (grocer store)
www.wholefoods.comthey have an entire isle of non toxic house hold cleansers.
a cheap cleaner would be apple cider vinegar and water, 2 parts water to 1 part apple cider vinegar, absolutely no other kind of vinegar is ok nor will it work, ACV is famous for its antibacterial properties.
that is the best thing to clean their cage with, also method makes cleaning wipes that are non toxic and i use those to clean the grate inside their cage. i do not get the scented ones, i get the unscented ones called go naked in the blue package.
try the method air fresheners, you wont be disappointed.