I am sure that the BluTack packaging has instructions on removing it from clothing but as I no longer have the packaging I am unable to help further; perhaps google BluTack and ask for advice from their customer services??
I accidentally leant the elbow of a knitted cardigan on a lump of Blu-tac and it is completely embedded in the fibres. I have picked off as much as I can, but it is still sticky. Any suggestions of a solvent that might work, or will washing dissolve it? I haven't tried washing so far as sometimes this will set a substance rather than softening it. Thanking you in advance.