I would try acetone/alcohol/water.

If that doesn't work, piranha.


"Vikrant A. Chaudhari :)"  writes:

hello,

is there a way to remove sticky adhesive, which is left over after a
cellotape is removed. we are using cello tape for masking while etching
SiN, and when cellotape is peeled of the sticky glue is left over. Is
there a better way to remove it with out scrubbing?

vikrant