What psi Pressure washer

Like the title says what is the safest max psi that won't chip the deck of my boat ?
I wan to get a pressure washer so i don't have to drag my boat to the car wash all the time. The deck gets pretty dirty from fishing.
Nauticstar 227xts.
Thanks

I have a 2800psi craftsman and with the medium tip its never caused any damage to my deck. Use it on my bay boat all the time. In fact I rarely use soap or a brush, just hold the tip about a half a foot from the deck and go at it.

yeah , you can use the "milder" tips

Ok guys Thanks