Thank you very much, guys!! Most helpful.
I now definitely give up the idea of even trying BBQ lighting fluid for stoves!
As for unleaded petrol from petrol stations, I am sure it doesn't cause a short-term serious problem, AS LONG AS it is very well ventilated (I have used it a few times). However the nasty contents like some aromatic hydrocarbons in it may cause something serious in the long-term, such as, cancer. So personally I avoid it when possible.
Panel Wipe is interesting (thanks, Iwan!).
A quick research showed it may be worth using, if one chooses the suitable one carefully (avoid cellulose thinners-based or water-based Panel Wipes, and consult MSDS (Material Safety Data Sheet), etc). Here are some links I have found.
http://www.outdoorsmagic.com/forum/forummessages/mps/UTN/14730
(NOTE: post by Ged Haywood)
http://www.outdoorsmagic.com/forum/forummessages/mps/UTN/8272
(NOTE: post by captain paranola)
http://www.network54.com/Forum/81021/thread/1089468726/Alternative+Fuel
(NOTE: post by PatrickS)
Cheers, Masa