sticky bonds?!?! helps

hey everyone, i have been a great lengths extensionist for four years now adn have used YHS for about 2 years and have experimented a few times with other lines...i had a client from the past that wanted me to remove her extensions although i didnt install them so i tried but the bond got sticky so i had her go to the girl who put them in...now my good friend got "free" bond extensions form someone and im trying to take them out for her and altho i tried the pliers it just took forever and left a llittle bond in her hair. so i used alittle great lenghts remover and it came out alot quicker but left a sticky feeling?? how do i take these out for her without the sticky leftover bond in her hair?? she cant find out what kind of extensions (bonds) these were