Delete Previews

I have changed config.php

‘preview_max_x’ => 512,
‘preview_max_y’ => 512,
‘preview_max_scale_factor’ => 1,

Now i would like to delete alle existing previews in appdata_ocXXXX and start alle over,
because it is to big, and slowing down my installation (> 500GB in appdata)
I am also aware that there is a bug in the current version. (Previews remains when files are deleted)
How do i delete all preview files .? there is no existing OCC command for that kind of “job”

Maybe you can try it: