turps

I've had good luck taking things outside, getting them wet, and then -- yeah, detergent/laundry liquid and a scrub brush, and rinse them with a hose until gunk stops coming out. But mine are pretty small -- if this is a big job, it might be worth seeing how much a steam cleaner would cost to rent. I think a lot of places do three-hour rentals. (That way might also leave you with less soggy carpet to get dry before you bring it back in.)