if you go on the karcher website refurbed k2 under £100 with an option of extended warranty
i use pro kleen snow foam does the job but there is better on the market will try valet pro once ive used 10 litres
for £20 or 15 for £25
look into the oil pump and getting the modified version what is your engine code?
if the egr was clogged it might have clogged the vains in the turbo but if it was the oil pump that starved the turbo wouldnt your engine have oil starvation
how is it running now
i owned a 2.0 tdi pd140 bre sold it on 240k it had a overboost code the vanes in the turbo where clogged changed turbo it was fine the oil pump shaft is a well known problem mine was fine no history of it being change neither did i
there are some people taking them out gpf opf whatever you want to call them i have not seen any one take them out in a vag car yet most of them are mercs wrench studio did one on a c43 which sounded amazing after a few on the 4.0 biturbo m177 deutsch tech did a glc63