I used laundry soap on my 14mil (7mil, double layer) cold water suit once, it left a horrible "stain" from the phosphates that I was never able to get out, looked like a sweat stain.
But, if its on Ehow, it must be true, especially since they have to honor the warranty from Wet Okole.. Go to a dive shop, they will tell you not to use laundry detergent. There are chemicals in tide and the like that break down the Neoprene, plus they are very difficult to rinse out, and willl "stain" the wetsuit. Or that advice could be words from the Man trying to get you to buy special chemicals. Just use the right chemical for the job, if you spend 500 bucks on seat covers (front and rear) you should probably spend the extra 5 bucks to take care of them, just my two cents, and I have actually owned multiple sets. I only need to do this once a year or so, not due to smell, but just to clean them. If you do not have window tint, I highly suggest the UV protectant as well.
PRODUCT CARE INFORMATION SHEET
WASHING INSTRUCTIONS
The more you wash, the longer they last. Washing your Wet Okole Hawaii seat covers will ultimately extend the life of your seat covers. Wet suit shampoo was specifically designed for cleaning and conditioning neoprene products. Cleaning with wet suit shampoo removes organic residue, micro-organisms and salt deposits that contribute to the deterioration of neoprene. Conditioning with wet suit shampoo helps prevent excessive drying, premature aging and oxidation of neoprene while continuing to keep the colors bright. Since Wet Okole Hawaii seat covers are waterproof, just wash the seat covers right on the vehicle. No hassles of taking the seat covers on or off. Combine water with your wet suit shampoo. Use a lint-free cloth and wash your seat covers thoroughly. Rinse your seat covers with fresh water and towel dry. DO NOT USE BLEACH OR DETERGENTS CONTAINING BLEACH! DO NOT USE A BRUSH or MACHINE WASH! HAND WASH and AIR DRY ONLY! Wet suit shampoo can be purchased directly from us or any other Wet Okole Hawaii seat cover dealer.