do not use a blade anywhere near the rear heating element , use a heatgun to warm the tint on the heated rear them pull the tint of slowly. You will probably have glue residue still on the window so get some soapy water in a spray bottle and spray the window the glue should turn white ish then use very fine wirewool to remove the glue .

if you use thinners you can end up spreading the glue all over the place.

for the side windows use a heatgun to warm the tint peel the tint off, spray the glue residue with soapy water then use a single edge blade the ones with the alumium strip (not a stanley blade) to gently remove the glue