I typically leave the battery and brake fluid compartments covered. I cover the alternator and the air filters with a towel. Never had any issues spraying the engine bay with hose on full jet blast. I try to spray components from above and avoid spraying sideways into them.
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2011 370Z 6MT Sport Gun Metallic | ARC | CJM | Ecutek | FI | Fujimura | R2C | SPL | Stillen | TWM | Z1 | ZSpeed |
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