Normally I just vaccum it out I try and not get much dirt or gunk in my boat, so it stay pretty clean. My only problem with the vaccums at the car washes is if you got a good one they work awesome, finding a good car wash vaccum is another story.
You know My brother runs a carpet cleaning business, we could maybe setup a day to all have our boats cleaned with professional equipment, I sure it would be the best the carpets have looked since they were new, and we should be able to do it for a reasonable amount, the more we got the cheaper we could do it for. Just a suggestion if anyone is interested, maybe a end of the year or something, of course it that’s ok with the mods too