Over the years I boiled, cooked and acetoned.
Cooking: 180 for about 5min, poss more dependant on the amount of glue.
results Can be a bit hit and miss, I used to take them out and run a screwdriver round to break the glue. the big down sides are burnt fingers, the kitchen and maybe about 50% of the house (dependant on the size of your mansion) will be enveloped in a toxic cyanid cloud
the smell lasts for days, wife/girlfriend will go mad and everything you cook for the next week tastes of hot schumacher mini spikes, oh and it can deform wheels to, the old losi ones hated it!
Boiling: Never really worked for me once I started to use decent glue. but you will have to boil for ages, suffer 10% burns to your fingers from boiling hot water as you try to get the tyre off, you need to have a go when you get them out of the pan as I found you could get 90% of the tyre of then find the glue was still stuck on the final bit.
Acetone: Buy off ebay, have a small air tight container, if you are only doing a few pairs of wheels at a time you only need 1 or 2 ltrs of acetone. Then as said cut most of the tyre off only leaving the bead, shove in container put lid on and forget for a day or two.Then pull wheels out, simply pull old rubber of and shove in bin, wipe rim clean and it's like new! It's by far and away the safest and easiest method, if your worried keep it outside, shed, garage,bin store. It's not that unsafe....it's strong nail varnish remover after all
I do wear gloves when using as if you have cuts etc WOW it stings, even the fumes get you