UV light anymore to erase them
uncover eprom window
place on windowsill in direct (UK) sunshine for about 30 minutes
Cool
Repeat 3 or 4 times
Note : using windows correctly saves cost of UV eraser.
About the only decent use I have ever found for windows & electronics ....
Note - in Tropics or high altitude places (Jo'burg) 10 minutes is about all it needs...