If it is the snap on type. Just unsnap the rugs and wash it in a commercial washer at the local laundry mat. Of course you will get stared at but no one can stop you. I find the powdered soap is best for this job, not the liquid. DON'T use bleach. I use Oxi-clean.
And don't dry it in a dryer. You will find that it will be hard to snap back into the boat.
