The biggest concern with this is thhat windshield washer fluid is made up of roughly 50-80% water. The rest is basically methanol, which means at high temperatures it is still combustible... If you only put half the bottle, i wouldn't worry about combustion. The only other thing in windshield washer fluid is ethylene glycol. Which is also found in anti-freeze... You are probably fine
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2010 370Z Touring MT | Stillen | Motordyne | Momentum| Z1 | Fast Intentions | Advant Garde | RE11 | Swift | SPC | Quaife | Whiteline | Evo R | 322RWHP 259ft-lb Mustang
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