My friend *ahem* putvegetable cooking oil into the kerosene in the stove because he thought it would burn all right.
But it doesn't burn all right. He must have put too much in (3 litres into a 10 litre tank). It might start out OK but the flame soon dwindles and so it stinks.
He figures out if he lets it burn down over ages and ages and adds kerosene in the meantime to top it up then eventually it will come right. But this may very well be a long and smelly waiting period the way things are looking.
Just a thought - Can he thin the kero with some gasoline - say half a litre in the ten litre tank - and this will get it to burn faster?
Of course he should bin the tainted kero and put some good stuff in and fix it that way. But if it can burn the stuff that's in it now then it wouldn't have been such a waste.
He knows gasoline contains poisons so he'd have the ventilation cranked-up until the waft of gasoline had disappeared.