I purchased a front chin spoiler thats mad e of a heavy plastic material and it was shipped with taht ups label thats clear and has a slip inside it so rain cant be damaged. But I removed the clear label after it sat for about a month and half, it left behind this hard glue like matter. Ive tried goo gone to remove it but that didnt do the trick. Anyone know of any product or way of removing a hard glue like substance of a hard plastic. Thanks

 

any ideas?? anyone please help