I'm just washing everything from our 15 days away... that's the longest all our gear has gone "at sea" without washing/drying.
I use a bucket of warm water with a squirt of squeezy and "Tesco everyday value microfibre cleaning cloths"... in 5 packs from kitchen products section. The cloths are the best ever as they don't shed annoying bits of fluff and they have a coarse texture so remove even quite stubborn marks/salt.
Gently rinse with a trickle from the hose. Even with waterproof electronic items I avoid over-testing in the area of case joins, screens, switches, sockets etc.
I wash the ropes and everything.
It's all out on the patio now in 28deg sun... perfect.