My experience has been wash clothes normally but not necessarily immediately. Leave shoes and gloves alone as after a few? hours the urushiol oxidizes or whatever and becomes inert. Thickness of clothes and shoes doesn't seem to matter, but I used leather gloves or at least leather faced gloves. Remember button cuffs have separations to bare skin. Guess how I found that out. So now I wear raglan cuffed sleeves. Now have some welding gloves from my son where the insulation messed up but the leather is still good. Wash hands and wrists with soap and water when finished.
My experience has been with poison ivy/oak here and in South Carolina. This article states the exact chemistry may vary:
"... Urushiol is a mixture of several closely related
organic compounds. Each consists of a
catechol substituted with an
alkyl chain that has 15 or 17 carbon atoms. The alkyl group may be
saturated or unsaturated. The exact composition of the mixture varies, depending on the plant source. Whereas
western poison oak urushiol contains chiefly catechols with C<sub>17</sub> side-chains,<sup id="cite_ref-9" class="reference">
[9]</sup> poison ivy and poison sumac contain mostly catechols with C<sub>15</sub> side-chains. The likelihood and severity of allergic reaction to urushiol is dependent on the degree of unsaturation of the
alkyl chain. Less than half of the general population experience a reaction with the saturated urushiol alone, but over 90% do so with urushiol that contains at least two degrees of unsaturation (double bonds). Longer side chains tend to produce a stronger reaction.<sup id="cite_ref-Tomas_10-0" class="reference">
[10]"
https://en.wikipedia.org/wiki/Urushiol
</sup>As to skin, if one merely brushes against it, water or even saliva within a minute or so seems to eliminate any possible contamination. Grabbing it barehanded or pressing/rubbing hard against it greatly increases chance of absorption. Washing with soap and water within ten minutes should prevent that. Alcohol works too.
While truly dry (dead) poison ivy probably won't hurt you, I don't blindly trust that because sometimes there may be some 'hidden' oil. One time in February many years ago I was pulling some thick vines that appeared dead. Had on jacket, long sleeve shirt, and gloves but later had a rash on one wrist. The jacket and shirt sleeves had button cuffs and some skin was inadvertently contaminated. The outside of the vines appeared dead/dry for the winter so I guess it was a broken end that got me.
If you ever get a major reaction, go to a doctor as it will get worse without medical help. Otc stuff works for minor rashes. If you catch a minor one as it just starts, sucking it hard either with your mouth or a snakebite kit may stop it. Yes that sounds crazy but as someone who has had major and minor rashes, I will do almost anything to avoid such. Btw that works for minor insect bites and stings.
As stated elsewhere, DO NOT BURN poison ivy/oak/sumac. The urushiol gets carried every where by the smoke and you can easily be contaminated without realizing it. Heard a real 'horror story' about that from someone who experienced it.
) Otherwise, I may have to chain saw that part of the hedge. And if I use Round-Up I may end up killing that hedge anyways.