removing old messed up tint?

[wells89]

hey all.

i purchased a 95 stang this time last year.

It had purple tint on the back winsheild and both quater panels,

the tint on the quater windows was fine looking accept i dont like purple. and the back windsheild it was half taken off/ripped and i can barly see outa my back window because of all the stuff the tint left behind. anyone know how to remove this stuff? and the tint in general. i want to get my hole car tinted limo black. im guessing i gota take this off first or the company tinting it wont tint it or will charge me extra?

thanks