With a proper resist, electro-etching steel works pretty well. I use
iron sulfate as my etch bath and it only takes 35-45m for a good
etch without having to wipe off the steel during the etch. You can’t
use toner only for a resist as it will get removed in the bath. A
good UV film works better. I have a tutorial at
(unfortunately it’s out of date w.r.t. resists, as I no longer do
toner transfer and haven’t had a chance to update it with the new
method I use).