If you could use a vacuum record cleaning machine and one or more of the better liquid record cleaners such as The Disc Doctor's Miracle record cleaner (my personal favorite). If you don't have access to a machine, manual cleaning would be next best. Do some searching thru AudiogoN and you will find many, many past threads on record cleaning, enough to fill a book I would dare say. I have contributed to several.
Cheers!
Cheers!