In short - made an ar$e of refitting one of the side skirts

and have had remove again. Trouble is - I used an equivalent of Sikaflex to re-attach and while I have cleaned the back of the skirt, there is still tons on the car. I don't fancy attacking paint with a stanley blade, so what removes this stuff? Thinners? Petrol? Blow torch? Atom Bomb?
Any other daft sod out there had to do the same??
Yours fery sheepishly
Steven