I used Simple Green for the intercooler both inside and out, then since a more TR-experienced friend of mine had told me to use gasoline to flush it out I did that too just to make sure I got it clean and the gas came out clean when I dumped it so I think the Simple Green did a pretty good job. I then rinsed it with plain water and used my shop vac to blow the inside of it dry for 1/2 hour or so--my vac has a large diameter hose so it fit into the intercooler/up pipe boot perfectly for this.
Mike
1987 
GRAND NATIONAL
Many changes planned but for now it has:- TE44 turbo
- MSD 50 lb. injectors
- Turbo Tweak 93 octane street chip
- RJC Power Plate
- VDO boost gauge in pillar
- adjustable FP regulator
- Hotwired fuel pump
- Fuel pressure gauge
- 8" K&N cone filter
- ESP coil pack
- 160° thermostat
- test pipe w/ cutout
- Flowmaster exhaust
- Scanmaster 2.1