I've decided to remove them entirely and try to use the CUPS web based method. What I discovered is that the script that comes with the HP package isn't very good at cleaning up and I don' think the synaptic one is either, seeing as there were still a bunch of hplip### drivers listed. and none that aren't hplip. I went and used synaptic to remove anything that came up with "hplip" in the search and tried the cups installation again. Now there were few hp printers listed at all, so progress, kind of.
After that I looked around for files and directories with "hplip" in their names and found
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/etc/dbus-1/system.d/com.hp.hplip.conf
/etc/sane.d/dll.d/hplip
/usr/share/hal/fdi/preprobe/10osvendor/20-hplip-devices.fdi
/var/cache/apt/archives/hplip-data_3.21.2+dfsg1-2_all.deb
/var/cache/apt/archives/hplip_3.21.2+dfsg1-2_amd64.deb
/var/lib/dpkg/info/hplip.list
/var/lib/dpkg/info/hplip.postrm