Hi I had the same problem Now I am using Dynasolv 210 (from a US company) and is working prety well. If you can leave the Si chip over night in Dynasolv and then leave it for 5 10 min in Ultrasound with Dynasolv and 5 min with acetone, this sould be enough. Another but "rough method" is using a razor blade to do as thin possible the PDMS layer. When is thin enough you can clean it if you wipe with some force with a textile with acetone. But this one is leaving some marks on SI The dynasolve 210 is around 100 bucks for a liter Petru On Wed, Mar 26, 2008 at 6:33 AM, Teimour Malekiwrote: > Hi All, > > I did PDMS molding on silicon substrate. I forgot to put soup and now the > PDMS has stocked to the silicon. I tried to remove it but it left lot of > residue. Would you please let me know if you have any suggestion? >