If you are convinced that your injectors are fouled up enough to require off the car cleaning, go to the junk yard and get a set of injectors for your vehicle and have them cleaned ahead of time. Then simply swap out yours with these. Only 1-2 hours of work and not difficult. Now you have your old set that you can send to have cleaned the next time, if required. If you are crafty, you can clean them yourself. But still, do the swap thing. You wanna minimize your vehicle downtime.