As far from JBS as possible !
The only way to clean the inside of the intercooler is to remove it. Removing the intercooler is a pretty big job as the whole front end needs to be removed to get to it as the intercooler is sandwiched between the air con radiator and engine radiator. Below is a pic of my car when i had my intercooler removed and upgraded.
06 Audi 2.0 PD140 Sport TDI Quattro S-LINE.
Old engine 330 bhp @ flywheel 263 bhp @ wheel 490 lb torque.
Audidriver write up HERE
Now stripped and playing with an uprated Cryo treated engine fitted with bigger turbo,water/methanol,uprated injectors etc etc.Wanting 400 bhp and 500 lb torque.
Other car 500+ bhp MK4 Golf R32 turbo