Clean install of OpenBSD but keeping existing partition table

[daemonbak]

Hi, borked an install and want to do a clean install of the whole #! and start with a virgin system. However, I would like to keep my partition table set as is. Of course just the partitions themselves, no actual data should remain

What would be the best way to do this? rm -rf /* and pxeboot to install?

Seems a little barbaric way to do it. Is there a way to wipe all the data, install via pxe and have it use the partitions that are already in place, just adding mount points to their entries?

Thanks