okay so i finally plucked up the courage and phoned the custy.
she was actually okay with it

i took kev@cleanerbrights advice really in the end and said
"hi hello i was unable to remove the paint from your patio window because its to old and to long ingrained and ive also scratched the glass. i didnt want to say that its scratched due to my inexperince and i shouldnt have used blades on toughened/tempered glass

and i said i would do the next clean for free and try and remove the scratched. and she said "okay thankyou"

RESULT HEY

so my plan is to toothpaste the scratch and use cellulose thinners to get the paint off the frame and glass then tell her ive got some better chemicals and done the paint removal in the end and hopefully i will gt the scratch out too! and she should be overjoyed
i know its a bit dishonest and i do feel bad, but i cant really afford to replace the glass without skinting myself and its a lesson learned and the patio door is very old too

what do you guys recon then?
george