need help!

i just got to find out that my front disc brake failed to apply on a crucial moment.
On further checking i realized a chunk of polythene(plastic bag) stuck b/w the brake assembly and the disc.
Tried pulling it out..its stuck tightly. The wheel is getting friction while moving!
And there are few residues of oil(maybe brake oil) on the polythene.
How can i remove it?

is it possible for me to remove the brake assembly myself and pull out the polythene?
Or should i go to Bajaj service?




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