I don't know what else to do but I would tell them at LuLu"s and I believe they will wash it for you again.
My experience with them is that if you're not satisfied with the wash, you can talk with the supervisor and they'll fix it, even a free wash.
I don't have much issue with that even with my predator steps... but I wipe my truck down with the free towels after I run through, so maybe I'm wiping it off without noticing
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