Weathering using "blackwash" Help

I am interested in using the "blackwash" idea on my ROTJ jet pack. I saw someone say to use "blue" windshield washer fluid and black acrylic (or what ever other color one might want to use with the black for a more dirty look). My question is why "washer fluid" and not just water?

Originally Posted by pennywisesweetooth

I am interested in using the "blackwash" idea on my ROTJ jet pack. I saw someone say to use "blue" windshield washer fluid and black acrylic (or what ever other color one might want to use with the black for a more dirty look). My question is why "washer fluid" and not just water?

My guess is because the chemical components in the washer fluid kind of break down the paint a little bit, toning the contrast and at the same time kind of "melting" the colors together for a more subtle, natural weathered look. From what I've heard thats what I'd make of it.

Because windshield washer fluid evaporates from the helmet very quickly as opposed to water.

Thanks, That makes sense I'll have to try it!