You need to look on the airline website for their dangerous baggage rules. Usually you have to notify the airline in advance that you intend to carry a stove in your hold luggage, they then give you approval and attach a note to your booking for the check-in staff. The generic (IATA?) guidelines are that you should empty a liquid stove of fuel and take steps to nullify any risk, which is totally reasonable. Some airlines lily-guild and ask for nonsensical additional packaging requirements. Finnair for example want stoves wrapped in cotton cloth. Take printouts of emails and regulations with you.
In my experience I have never had the check-in staff even ask about the stove until I have pointed out that they should look at the booking notes, they then agree that it's an empty stove and it's fine. I find that petrol fumes disappear quicker than other fuels, and on the way back I just use washing up liquid and water to get the worst out the night before, if I had anything more perfumed to hand I would swill the bottle with that. I usually pack the lid separately from the bottle so that they can't argue things could mysteriously pressurise, and it's obvious it's empty and dry. This superstitious habit came about after I had a trangia burner confiscated on my way home from New Zealand after they argued it constituted an explosive risk. Apart from that one incident (which was part of the Terror hysteria of 2001) I have never had problems.
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