I cannot find the zipper to remove them, how do you guys clean them. After 15 years of dirt and all, these seats could use a drycleaning. But How?

 

Every carpartshop will stock a lot of interior/upholstery cleaner/spray.....!!
Just find one that's your taste....to me they all work the same..!!

 

Just a spray?

 

Yes, spray/foam or whatever, and a brush and some towels of course, works perfect, time consuming though....!!

 

I use that rugdoctor thing you can rent from grocery stores, along with the little handheld upholstery cleaner thing you have to buy with it, works wonders, takes any and every stain off with no problem, and it leaves the car smelling good too!

 

to answer the original question though: hog rings. Do a search, i'm not super familiar with it... You may need hog ring pliers though... (this is instead of a zipper eh?)
just be careful it doesn't shrink (ie, probably don't wanna toss it in your wash...)
I've used a rented steam cleaner ($24 for a day I think...) to do that... I was somewhat disappointed with the results... but that's just me...

 

get out get yourself a good hig powered shop vac, and a steamer from sears. steam the seats well, then vacuum them.

worked for me