Since Laguna Seca doesn't have laundry facilities, here is the closest/cleanest laudromat I am aware of....
BALLARDS FREMONT WASH AND DRY
2319 Fremont St
Monterey, CA 93940
Hours: 8am-7pm - seven days a week.
Change machine, soap and dryer sheet machine. No restroom
Take a right onto highway 68 as you exit Laguna Seca RV Park.
Right on Canyon Del Rey
Left on Fremont street for about 2-3 blocks
Start looking on the right once you pass Hannon Street. There's a big sign that says "WASH DRY" ...There's a sports/trophy shop next door. If you've come to 7-11 and Ramona street, you just missed it.