The best way to find out how many liens and how much they are is to go to the Fairfax County courthouse and look it up in the land records department. It is public access, but not available online to the best of my knowledge.
Or you could hire a title company to do a full title search and it would cost somewhere around $100.
AJ Heidmann, ABR, CRS, e-PRO
Cell 703-474-1260 ~ Office 703-518-8300 ~ Fax 703-518-8314
Coldwell Banker Residential Brokerage
310 King Street, Alexandria, VA 22314
Licensed in Virginia