Can dry ice clean a 4WD undercarriage caked in mud and tar?
Yes — heavy condition multiplier applies, but caked-on contamination clears in passes.
Verdict
Yes
Heavy condition pricing applies but the result is bare-metal-clean chassis revealed.
The detailed answer
4WD and ute undercarriages take the worst of every road plus off-road excursion buildup. Tar, mud, sand, salt spray and oil mist build into thick layers that pressure-washing struggles to fully shift. Dry ice handles it through repeat passes, with pressure stepped up to 130-160 PSI for chassis rails and lower for bushes and electrical components. Heavy condition multiplier (×1.65) applies. Typical job: 4-6 hours, $1,000-$1,600 for a heavily-built-up 4WD. Particularly valuable post-Cape-York / Simpson Desert before mechanical work, or pre-sale for trade-in presentation.
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