I've heard good things about the Chevron Techron stuff. I always used Mopar Fuel Injection cleaner that the dealers sell, not sure who makes it for them but I grew up using the stuff. It worked well, especially in conjuction with the combustion chamber cleaner once a year (never chanced the stuff in the rotary though).

The CCCleaner is nasty stuff, you have to change the oil after running it.

 

using a brake booster line will clean carbon and build up in the combustion chamber. Putting throught tank will clean injectors. Also for anyone experimenting will cleaners...stay away from seafoam, i remember reading a thread about someone using it and blowing like a day or so later. It is extremely productive in piston engines through the booster line though.

 

It has been a while since I have used it but I did pour about 1/2 - 3/4 in the tank the rest through the brake boost vaccume line.

 

Chevron Techron user here. Once a year or so it goes on sale and I use it with just a 1/2 tank of gas.