Black streaks on lighted signage

Hello everyone. Ive been asked to clean some signage. Client sent the following pics. Im thinking of trying gutter grenade but thought id post to see if anyone has run into this before. Maybe someone here has a better solution. Thanks!!


I’ve always used housewsh mix, being careful where I put it, if the sign is older or Brittle, however, sometimes the streaks are in the inside, only accessible if the signs taken apart. It can be tricky to tell.

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That’s inside the sign

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So i was able to confirm that the streaks are outside and that my softwash mix did not make a difference. Gutter grenade and a little brushing worked great. The client wanted to pay me $30 for the work but i managed to show him the result in these pics and he agreed to a more appropriate price. I wil send after pics when it is complete. Thanks, Traskrider, i appreciate your advice and your results looked great.


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Nice!

Like @Racer has said many times- sometimes getting out a brush and doing a little scrubbing can save a lot of time.

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