You mean Ether....Starting Fluid?
Thats comprised normally of Diethyl Ether, Hexane and Heptane, somtimes with a mineral spirit for upper cylinder lube. And a propellant in the can, like isobutane, CO2, propane. So if your not careful, you could end up with a bomb on your hands. Also, the effects of ether on yourself, can get you all screwy and it bad for you. AND importantlly, if you have left over ether like in a bucket or somthing, get rid of it. If ether is stored in plastic, it can leech out. Very importantlly, if ether is stored in a clear container where any light can get to it, IT CAN FORM EXPLOSIVE PEROXIDES
Bad, bad!
I know this stuff because my R/C diesel airplane engines run on special diesel thats 40% ether or more. Same rules apply. Pre-mixed r/c diesel is hard to find and expensive
Dont take my word for positive, but ether and the brake spray mentioned causing phosgene gas are very differant. The concerned cleaner is prolly the CHLORINATED type. I use NON-chlorinated to start stuff plenty. its basiclly laquor thinner in a can