Whoops: the correct CSS is of course:
body.hellobar-hide #dwpb {
display: none !important;
}
These instructions made for hiding Hello Bar on specific pages work just as well for DW Promobar. You can use the exact same PHP-code. You only need to replace the css code
body.hellobar-hide #hellobar-wrapper {
display: none !important;
}
with
body.dwpb-hide #dwpb {
display: none !important;
}
