a lot of people do it that way, its not as effective, but to clean valves, its the only way to get cleaner down there without taking everything off. Just keep the car running (using throttle link) and spray 10 seconds into the throttle, and then let the engine work the cleaner out fir 10 seconds (it's ok if it stalls, it probably will once or twice). Then repeat it until you've used the whole can.
Silver 1998 Mystique LS (v6)...ATX

Removed Emblems, limo tint, painted calipers.
Premier P630 HU with 4 Pioneer TS-A6895 Speakers with 10' Sony sub (yeah i know, i'm cheap)
Commando 501-S Alarm