i jump my KH into loose, soft sand about once a month. so long as you don't get sand in the bearings commonly and give the uni a good rinse (or pressure washing at the car wash) it turns out fine.
i've done this process about 10 times. the uni is in disrepair for other reasons at the "moment"
Sealed bearings will last for decades and give excellent performance. If you leave them alone. Careless use of a pressure washer will blow past the bearing seals.
I would say never pressure wash a uni. Most people are to ignorant to understand the damage that can be done.
Ride it in the surf all week. Then throw it in the pool and leave it there overnight. Don't forget to flatten the tire, break the rim stick, and take the seat post off and throw it into the far side side of the pool. 😄
