pzuurveen 90 Posting Whiz in Training

i got a testing blog that got spammed. So I removed the entire blog. Now weeks later, my errorlog still get thousends of 404's a day.
I still want to see 'normal' 404 from other sites on that server.
There are no files in that dir but .htaccess:

RewiteEngine on
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.php)$ -[G,NC,E=dontlog:true]
#deny from all

and in my httpd.conf:
customLog logs/access_log combined env=!dontlog
how do I something simular to my errorlog?
or do I need a diverent solution?