I need some help with a vibe purchase. We're looking for something that will work well during a sploshing session and won't break if you wash it thoroughly. I see Hitachis used often, but what's their longevity like when it comes to washing off your sploshing session?
Anything marketed as "waterproof" should also be mess-proof. Most sex toys wash off easily enough if you clean them before the mess dries on them and after a quick wash in soapy water I tend to give them a wipe with a neutral toy cleaner (wipe or spray) available from most sex toy retailers
Check the IP rating (Ingress Protection); higher number= more waterproof. You ideally want 7 or 8 for messy play (immersible/submersible in water)
Some toys claim waterproof and have much lower IP ratings- which is fine for a quick wash off or use in the shower, but probably not up to scratch for full on messy play.
Condoms are also great for helping to keep your toys clean/sanitary too.
If you have a separate battery compartment (inflatable dildo seat), wrap the compartment in a plastic sandwich bag and pull the knot fully tight. Not fully immersible, but it'll keep the batteries dry as long as you don't leave the bag submerged.