Spray bottle with a mix of water and Johnson's Baby Shampoo.
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For multiple dives on a given dive day, it can be helpful to briefly rinse the sealing surface of the latex neck seal with fresh water. If saltwater dries on that surface, it can really irritate the skin. It's one possible cause of a hangman's noose-type neck abrasion.
Drysuit owners observe various lifespans for the latex seals on modern drysuits.
Lots of factors probably affect how long the seals will last: climate/humidity of storage conditions, presence of ozone-generators where the suit is stored, age of latex seal prior to installation, storage of the seals prior to installation, the composition of a person's sweat, exposure to contaminated water, how well the seals are cleaned after diving, UV damage to the seals, whether a "seal saver" solution is used, whether a "seal saver" product actually works, how gentle a diver is when doffing/donning the suit, etc.
I'm still working on the original wrist seals that came with my Bare suit several years ago. I suspect that had I not installed the Viking Bayonet dryglove system a couple of years ago, I probably would have had to change the wrist seals by now. FWIW, I really don't have much of an air-tight seal on my right wrist should the dryglove fail.
I've had a somewhat different experience with latex neck seals. They seem to be much more short-lived than the wrist seals. My original neck seal only lasted about 18 months. Since then, I've had one neck seal that lasted 2 years and another that began disintegrating in 6 months following installation (caused by a several-day exposure to a wall-mounted, old-style gas furnace)...but I stretched another 6 months of life out of it with copious amounts of duct tape. YMMV.
@Aqua-Andy: Yup. I have a Bare Nex-Gen, and I have replaced the latex neck seal (bellows-style like the stock seal) myself. The adhesive to use is called PB-300 made by OS Systems.Not to hijack the thread but have you replaced the neck seal on your suit your self? As I recall you have a Nex-Gen correct? What do you use to glue the new neck seal on with? I was going to install a new seal on my Nex-Gen by cutting the old seal off to the point where it it glued to the suit and use dry adhesave tape to attach the seal to the old seal.