Cleaning up under fenders/frame?

Currently have 2017 with 30k miles on it. What's the best way to remove the accumulation of dirt and grime that is up in the fenderwells and on the frame? Would pressure washing damage the finish on the frame? There also some flexible rubber like pieces locate din the front fenderwells that shield the bottom parts of the motor.

Just don't want to cause any damage.

 

I have a foam cannon that i mix in dish soap and water, spray it under there and let it sit for about 15-20 minutes, and rinse it all well, once dry i reapply FF or cosmoline based protectant. I do this twice a year usually early spring (around this time) and late fall before winter

I've done this since i got my truck new and living in the salt belt/midwest, i barely even have surface rust anywhere.

 

from:
Rust Prevention/Treatment Consolidation Thread | Tacoma World

http://www.tacomaworld.com/forum/2n...-rust-after-dealer-undercoat.html#post9931880
http://www.tacomaworld.com/forum/1st-gen-tacomas/363948-salt-belt.html#post9914218
http://www.tacomaworld.com/forum/1st-gen-tacomas/363280-when-wash-salt-off-truck.html
http://67-72chevytrucks.com/vboard/showthread.php?t=353930 (forum)
http://www.jalopyjournal.com/forum/threads/clean-a-frame-with-out-sand-blasting.741102/ (forum)
http://www.legendarycollectorcars.c...underside-of-your-car-the-easy-off-challenge/ (forum)
http://www.hotrodders.com/forum/sandblast-pressure-wash-frame-197542.html (forum)
http://www.tacomaworld.com/forum/1s...me-rust-fix-what-works-best.html#post10045109
https://www.tacomaworld.com/threads/removing-fluid-film-and-the-filth-it-collects.391626/
https://www.tacomaworld.com/threads/frame-issues-should-i-undercoat.399888/#post-11105854
https://www.tacomaworld.com/threads/frame-issues-should-i-undercoat.399888/#post-11105418
https://www.tacomaworld.com/threads/frame-issues-should-i-undercoat.399888/#post-11105538
http://www.pressurewashersdirect.com/power/undercarriage-cleaners.html
http://www.autogeekonline.net/forum...under-car-washer-water-pressure-question.html
https://www.tacomaworld.com/threads/potential-rust-location-found.407339/
https://www.tacomaworld.com/threads/tacoma-hidden-leaf-trap.255737/
https://www.tacomaworld.com/threads/winter-wash.412051/
https://www.tacomaworld.com/threads...solidation-thread.355928/page-4#post-11718350
https://www.tacomaworld.com/threads/2015-frame-rot.415388/page-2#post-11785916
https://www.tacomaworld.com/threads...estroy-itself-with-rust.429307/#post-12339553
https://www.tacomaworld.com/threads/cold-weather-washing-tips-tricks.465969/
https://www.tacomaworld.com/threads/winter-washing.468740/
https://www.tacomaworld.com/threads/inexpensive-undercarriage-washer.530082/
https://www.tacomaworld.com/threads/undercarrage-washer.531280/
https://www.tacomaworld.com/threads...e-possible-to-damage-it.587458/#post-19599959
https://www.homedepot.com/p/RYOBI-P...ickid=zbPU5G0EExyOWPQwUx0Mo38XUkn1USXHPQMW3Q0
https://www.tacomaworld.com/threads/washing-in-winter.700121/