Friend Andy's ancient parents (APs) have had their rotting wooden widows replaced with UPVC double glazed units.
They want to refit their net curtains without drilling into their shiny new UPVC. Note the word 'shiny', none of the normal sticky hook-type things will stick to the UPVC.
Regrettably Andy would like assistance in his search for a means of fixing his APs net curtains close to the glass..
TIA
Richard