Silicon products typically can be removed by a dish detergent like Dawn.
Dawn is commonly used in the USA to strip old wax off before a polymer sealant is applied to the paint.
Just found this thread after watching an old science programme I'd saved on Sky - whether Tutankhamun was the subject of a botched mummification and spontaneously combusted due to the linseed oil used for his embalming catching fire.
Couldn't help thinking of the embalmers being given a bollocking and blaming the new-fangled product they'd been told to use!!