I use a plastc spray bottle with. 1/3 simple green, a 5 sec. blast of this stuff called PB Blaster (a better version of wd-40) then the rest water...I use to add denatured alochol too. no need for. this spray works great for me. I clean the whole truck....the real caked on oil stuff i blast it with nitro pray.
but i dont let my trucks sit for any lenth of time...And when I'm at the track i use my spray right b 4 go n back on the track. Pray the shocks, cvd's, sterring linkage, all moving part...it makes everything nice and loose /free.