hi there, my name is Adam
actually, I clean compromised (malwared) websites and hosting account on a daily basis as a freelancer
not only at freelancer.com - I cooperate with creative agencies, with developers etc.
in my full-time job, I'm a server admin
of course, I use few tools (most of them are commercial), tools are important, speeds up the whole process and helps a lot, but an experience and some knowledge is most important :)
just send me some more details or let's talk on chat about this project
ah, the price may vary and highly depend on how many sites/server accounts do you have, what kind of websites etc - as cleaning 100+ active domains with WP/J!/PS etc. is nothing unusual to me, probably I couldn't do this for $50 :)
regards,
Adam