This is a passage from The Turbo Regal Website:
It is also a good idea to annually pull the intercooler out of the car and perform a thorough cleanup both inside and out. To remove the intercooler, remove the intake tube and loosen the hose clamps that attach the intercooler to the turbo outlet. Wiggle the hose away from the intercooler as far as possible.
Next, remove the front scoop by undoing the little screws that attach the housing to the intercooler. Then undo the two 10mm bolts on the passenger's side and the one 10mm bolt on the driver's side. The last bolt is on the underside of the intercooler on the passenger's side. Then carefully lift the intercooler out of the car.(I removed the intercooler scope, found it was easier to get it out)
Once the intercooler is out of the car, you can begin the cleanup procedure. First, spray an entire can of the oxygen sensor safe carb cleaner into the intercooler. Do this in a well ventilated area! "Slosh" the fluid around in the intercooler for several minutes. Then dump the fluid out and repeat until the resulting fluid is clean.
Once it is clean, I normally go to the car wash and use the high pressure washers to clean the fins and the outside of the intercooler. This removes the road grime, bugs, etc. from the fins and ensures that the intercooler has good air flow. Be sure to be careful not to bend or crush the fins when using the high pressure washer. You can also use the LOW pressure setting on the washer to rinse out the inside of the intercooler. This will remove any residue left from the carb cleaner.
Finally, I like to take my Wet/Dry Shop Vacuum and duct tape the hose to the intercooler tube. I then tape a thin shop rag over the other tube and let the vacuum run for an hour or so with the intercooler in the inverted position. This will remove most of any remaining moisture from the intercooler.
Reinstall the intercooler and intake tube. Now is a good time to set your Throttle Position Sensor (TPS). The TPS is the little gadget on the passenger side of the throttle body that tells the ECM the angle of the throttle blade. It attached by two screws in a slots that allow you to tilt and change the angle of the sensor. The easiest way to adjust the sensor is to find someone with a scan tool and adjust for 0.42-0.44 volts at idle and 4.75-4.9 volts at WOT.