Bogachiel State Park should have showers, though they may be currently closed for the winter. Their phone number is on their website, you should be able to give them a call for more information: https://www.parks.wa.gov/478/Bogachiel

Bogachiel State Park, 5 or 10 minutes south of Forks has showers in the campground restrooms.

Get Yourself a joolca and take a shower when ever you're near a stream.

https://www.joolca.com/products/hottap-v2?nbt=nb%3Aadwords%3Ag%3A8310099056%3A86963577058%3A562301967540&nb_adtype=&nb_kwd=%2Bjoolca%20%2Bhottap&nb_ti=kwd-333423593891&nb_mi=&nb_pc=&nb_pi=&nb_ppi=&nb_placement=&nb_si={sourceid}&nb_li_ms=&nb_lp_ms=&nb_fii=&nb_ap=&nb_mt=b&gclid=CjwKCAjwoIqhBhAGEiwArXT7K0dcMsVxiXI6g_cLGrrUI-V5YI9RcBsb7de1T-CfZI0ZoB4a-uPL9hoCU5IQAvD_BwE

Not sure what your situation looks like but people in my city will pay for a gym membership and use those showers daily. Ours is $35 a month which might be too pricey but it would be a solid investment for hygiene

Sol Duc Hot Springs

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We’ve been there. This is good info.

Salt Creek has coin showers. If you go to Sol Duc Hot springs they have a locker with showers as well. We did the hike then showered and soaked in the hot springs for an hour

I mean you can recreate this on the cheap if you want by heating water over the campfire till shower warm then use a USB rechargeable shower head

Thanks! I am surprised this didn't come up in my search.