Sauna. And not that joke-of-a-sauna but a real Scandinavian sauna with 80°C / 176°F. One thing with ticks is that they can take an enormous amount of beating and other forms of killing attempts but they're extremely vulnerable to heat. Same thing with deer flies.
You can also try with a hot shower but you really have to gradually crank up the heat as much as your skin can take. As its body temperature reaches 42°C/107°F its proteins start to coagulate and it dies.