My 93 smelled like it was parked in a swamp for a couple of months prior to purchasing. I removed the entire interior and misted the floor pan with a 50/50 bleach & water solution. This was done twice over two days, allowing the solution to dry between applications. Then it was washed with soap and water. Meanwhile, all of the padding was washed with a deoderant cleaner and a garden hose. The front mat didn't survive the removal and the middle piece became distorted after the wash as to not be able to retain the shape of the carpet between the seats and doors anymore. Fortunately, I was able to salvage these pieces from a parts car.
With the sunroof open, I can still smell a musty smell. I believe it is coming from the rear seatback.