Eventually after some fiddling I got all the partitions, off. so i had to change some of them in Fdisk guid partitions were marked as non deletable.
Windows couldn't remove some of the partitions. Removed every partition, so yes it was scary (wasn't totally sure restoring mac OSX would work). Used the bootcamp windows install usb disk to completely format and remove all mac partitions. And I used bootcamp but used it to completely remove mac os x
